Waste trap

Abstract

A waste trap (110) for fitment to a drainage outlet of a drainage network, for example the drainage outlet from a sink, wash basin or the like. The waste trap has an inlet (112), an outlet (114) and a chamber (116) between the inlet and the outlet. The chamber has a disposal opening (120) with a removable closure element. A strainer (126) spans a part of the chamber.

Description

[0001] WASTE TRAP

[0002] FIELD OF THE INVENTION

[0003] This invention relates to a waste trap, and in particular to a waste trap for fitment to a drainage outlet, for example from a sink, wash basin or the like.

[0004] BACKGROUND TO THE INVENTION

[0005] Many premises include a network of pipes delivering mains water to taps and also to appliances which use water such as washing machines and dishwashers. The premises will also typically include a network of drainage pipes through which waste water can flow to the mains drainage system.

[0006] Often, the drainage network will include junctions by which the waste water outlets from multiple locations can be interconnected. For example, a junction may be included underneath a kitchen sink, the junction having multiple inlets connected to one or two sinks, a dishwasher and perhaps also a clothes washing machine, respectively. The junction will typically have a single outlet in direct communication with the mains drainage system, or in indirect connection by way of another junction or junctions.

[0007] The drainage network will often include one or more vertically-oriented U-bends around which waste water must pass. Each U-bend provides a water trap, i.e. a low point for the waste water in which a small volume of waste water is retained to act as a liquid seal in the drainage network. The liquid seal prevents odours in the mains drainage system from entering the premises.

[0008] The waste water outlet of a sink or wash basin is often called a plughole and most sinks and washbasins will include a plug for blocking the plughole when it is desired to temporarily retain a volume of water in the sink or wash basin. The plughole will typically be spanned by a number of intersecting cross-bars which together provide a coarse strainer which can act to prevent large-sized debris passing through the plughole. Many sinks also have a dedicated strainer mounted in the plughole which can capture debris, the strainer being removable to permit disposal of the captured debris and cleaning of the strainer.

[0009] The plug may be flexible and resilient and inserted by the user as and when required. Some washbasins, however, have fitted plugs, often called pop-up plugs.

[0010] A pop-up plug is mounted to the plughole and can move between a closed position in which it spans and seals the plughole and a raised position in which water can flow past the plug and through the plughole. The pop-up plug may be connected by a linkage to an actuator mounted to the tap whereby the user may use the actuator to raise and lower the pop-up plug as desired. Alternatively, the pop-up plug may be spring-biased to its open position and can be pushed down to the closed position by the user.

[0011] A part of the linkage and the supporting structure of the pop-up-plug is located in the drainage pipe below the plughole and acts to centralise the pop-up plug relative to the pipe and plughole, and also to maintain the correct (horizontal) orientation of the pop-up plug. The alignment and orientation of the pop-up plug are therefore maintained as the pop-up plug moves between its open and closed positions.

[0012] The linkage or supporting structure is necessarily configured to allow waste water to pass through the drainage pipe when the pop-up plug is opened.

[0013] Notwithstanding the coarse filtration action of the plughole or strainer, some debris will inevitably pass through the plughole and can become trapped in the drainage pipe. It is known, for example, for hairs to become wrapped around a part of the linkage or support structure, and over time a significant amount of hair can become trapped in the drainage pipe. A large volume of hair and other debris must be collected before the drainage pipe becomes sufficiently blocked for the rate of waste water outflow through the plughole to become noticeably reduced; removing a large volume of collected hair and other debris can be a difficult and unpleasant task. The collected debris may include waste solids from a sink and / or dishwasher and fluff and hairs from a clothes washing machine, for example. It is not always possible to dismantle the drainage network to access the blockage, and even if the network can be dismantled the removal of collected debris can be difficult and unpleasant.

[0014] The trapping of debris in the drainage pipe below the plughole is a problem which occurs in many domestic dwellings. Many occupiers of those dwellings will not be able or willing to access the drainage pipe as will usually be required to remove the collected debris. Instead, the occupier may use chemicals to seek to dissolve or disperse the collected debris. The chemicals required are harsh and can be damaging to health, and are not always effective at completely removing the collected debris, so that repeated uses of the chemicals may be required.

[0015] SUMMARY OF THE INVENTION

[0016] It is an object of the present invention to provide a waste trap for a waste water drainage network.

[0017] It is another object of the present invention to provide a waste trap which can readily be cleaned.

[0018] It is another object of the invention to provide a waste trap which can be fitted into an existing drainage network in a location where it can readily be accessed for cleaning.

[0019] According to the invention there is provided a waste trap for a drainage network, the waste trap having an inlet, an outlet and a chamber between the inlet and the outlet, the chamber having a disposal opening with a removable closure element, the waste trap having a strainer which spans the chamber. The strainer is configured similarly to the strainer fitted to the plugholes of many sinks and wash basins, and has multiple holes, slots or the like to provide a coarse filter for trapping debris whilst allowing waste water to pass through.

[0020] During use of the invention, the waste trap forms a part of the drainage network of the premises through which waste water flows to a mains drainage system. For example, the waste trap may be connected to the drainage pipe beneath the plughole of a kitchen sink. Waste water flows through the chamber from the inlet to the outlet. Debris in the waste water is captured by the strainer and retained in the chamber. The closure element may be periodically removed to allow access to the chamber and the removal of the collected debris.

[0021] Unlike the waste water outlet of many kitchen sinks, the waste trap seeks to capture debris in a specific location (the chamber) rather than allow that debris to pass through and perhaps become trapped in another (uncontrolled) location within the drainage network. Unlike the waste water outlet of a wash basin with a pop-up plug, the waste trap provides a dedicated location for the capture of debris rather than the incidental and uncontrolled capture by the linkage or support structure of the pop-up plug. It will be apparent that providing a dedicated location at which debris can be captured is highly beneficial as compared to the uncontrolled collection of debris at unwanted and perhaps inaccessible locations.

[0022] Furthermore, providing a disposal opening for the chamber and a removable closure element allows the collected debris to be removed and disposed of much more easily than would be the case if it was otherwise necessary to disconnect and / or dismantle parts of the drainage network.

[0023] Preferably, the waste trap has multiple inlets. Preferably also, the inlet(s) have respective inlet connector for connection to other parts of the drainage network. The outlet preferably also has an outlet connector for connection to another part of the drainage network. The waste trap can thereby be used below a kitchen sink for example, with one inlet connected to the plughole of the sink and another inlet connected to the outlet of an appliance such as a dishwasher for example. The size and structural form of the multiple inlets can differ whereby to allow the connection to different waste water sources.

[0024] Preferably, the waste trap has a single outlet. Accordingly, in embodiments having multiple inlets the waste trap also provides a junction in the drainage network.

[0025] Preferably, the inlet connector comprises a screw fitting. Preferably also, the outlet connector comprises a screw fitting. Providing screw fittings enables the releasable connection of the waste trap to adjacent parts of the drainage network and facilitates fitment into an existing drainage network. It will be understood that screw fittings are commonly used to interconnect parts of the drainage network, for example to interconnect a drainage pipe below a sink to a U-bend. Each of the screw fittings can have a seal to prevent water leakage, although it will be understood that the adjacent parts of the drainage network to which the inlet and outlet are connected may provide the seals.

[0026] To install the waste trap, a piece of the existing drainage network may be removed to allow the insertion of the waste trap, or parts of the existing network which are screwed together may be separated and reassembled with the waste trap inserted in between those parts. For example, a drainage network may include a U-bend which is connected by respective screw threads to upstream and downstream parts of the drainage network below a kitchen sink; the U-bend can be unscrewed and reassembled with the waste trap inserted upstream of the U-bend.

[0027] The screw fittings also facilitate the installation of the waste trap in a new drainage network, it being recognised that many drainage networks have screw-fitted connections between different parts of the network.

[0028] Whilst it is not expected or intended that the waste trap is removed from a drainage network once fitted, the provision of screw fittings enables the removal if required.

[0029] Preferably, the strainer is located at or adjacent to the outlet. Whilst it would be possible to locate the strainer anywhere between the inlet and the outlet, locating it at or adjacent to the outlet maximises the volume of the chamber in which debris can be collected. Alternatively stated, the overall volume of the chamber and therefore of the waste trap can be minimised if all (or substantially all) of the chamber is utilised for the collection of debris.

[0030] Desirably, the strainer is permanently mounted in the waste trap. It is therefore intended that the disposal opening is sufficiently large to enable the removal of collected debris through the disposal opening when the closure element is removed. It is therefore not necessary to remove or dismantle the waste trap in order to remove the collected debris.

[0031] Alternatively, the strainer may be removable from the chamber for cleaning, a removable strainer being more suitable if access to the chamber is restricted, for example at the drainage hole of a shower.

[0032] Preferably, the waste trap has a primary strainer and a secondary strainer located in the chamber. Desirably, the secondary strainer is removably mounted and is located upstream of the primary strainer. Preferably, the secondary strainer spans all or a large part of the chamber between the inlet and the primary strainer. Preferably, the secondary strainer can be removed through the disposal opening.

[0033] Accordingly, when the closure element is opened the secondary strainer can be removed from the waste trap and the debris which has been captured by the secondary strainer can be disposed of, for example by taking the secondary strainer to a waste bin or the like. The primary strainer can also be accessed and any debris which has passed the secondary strainer and been captured by the primary strainer can be removed from the waste trap and disposed of.

[0034] In some embodiments a part of the chamber comprises a removable chamber insert. Collected debris is disposed of following removal of the chamber insert. In such embodiments the chamber insert may also provide the closure element, i.e. a part of the fitted chamber insert closes the disposal opening. BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] The invention will now be described in more detail, by way of example, with reference to the accompanying drawings, in which:

[0036] Fig .1 shows a first embodiment of waste trap according to the invention;

[0037] Fig.2 shows a plan view of the strainer of the waste trap of Fig.1 ;

[0038] Fig.3 shows a second embodiment of waste trap according to the invention;

[0039] Fig .4 shows a third embodiment of waste trap according to the invention;

[0040] Fig.5 shows a plan view of the secondary strainer of the third embodiment;

[0041] Fig.6 shows a fourth embodiment of waste trap according to the invention;

[0042] Fig.7 shows the removable chamber insert of the waste trap of Fig .6; and

[0043] Fig.8 shows a fifth embodiment of waste trap according to the invention.

[0044] DETAILED DESCRIPTION

[0045] A cross-section of first embodiment of waste trap 1 10 according to the invention is shown in Fig .1 . The waste trap 110 has an inlet connector 112, an outlet connector 1 14 and a chamber 1 16 between the inlet connector 112 and the outlet connector 1 14.

[0046] In common with many components for installation into a water pipe network, the waste trap 1 10 is made of plastics material. Also in common with the known components, the inlet connector 112 comprises a threaded collar which can be releasably connected to another part of a drainage network (not shown), for example the drainage pipe of a kitchen sink. In known fashion, the inlet connector 1 12 is of circular cross-section with a diameter and screw thread corresponding to the drainage pipe.

[0047] In known fashion, the flange 118 which retains the threaded collar has an integrated seal to prevent the leakage of waste water passing through the inlet connector 1 12.

[0048] The outlet connector 114 also comprises a threaded collar which can be releasably (and sealingly) connected to another part of a drainage network (not shown), for example a U-bend.

[0049] The chamber 116 has a disposal opening 120 with a removable closure element 122. The closure element 122 can be fitted to the disposal opening 120 by way of cooperating screw threads. The closure element has a seal 124 to engage the disposal opening whereby waste water does not escape past the fitted closure element 122.

[0050] A strainer 126 spans the chamber 116 between the inlet connector 112 and the outlet connector 1 14. The strainer 126 is downstream of the disposal opening 120.

[0051] In use, the waste trap 1 10 forms a part of a drainage network, for example with the inlet connector 1 12 connected to the drainage pipe of a kitchen sink and the outlet connector 114 connected to a U-bend and subsequently to the mains drainage system. Waste water can flow through the inlet connector 112, chamber 116 and outlet connector 114.

[0052] The strainer 126 is shown in plan view in Fig.2 and has multiple (in this embodiment nineteen) circular holes 130. The number and shape of the holes in the strainer are not significant and can each be varied without departing from the invention. However, the holes should be sufficiently small to capture debris which has passed into the drainage network and which might become trapped in other unsuitable locations, for example at the U-bend. Also, the holes 130 are sufficiently numerous to allow waste water to flow through the strainer 126 at an acceptable rate, and close to the rate at which it can pass through the plughole upstream of the water trap 1 10. In this embodiment the holes are 5 mm in diameter.

[0053] Debris in the waste water is captured by the strainer 126 and retained in the chamber 116. In this embodiment the strainer 126 is located very close to the outlet connector 114 and so almost the whole volume of the chamber 116 between the inlet connector 112 and the outlet connector 114 can store collected debris.

[0054] It is expected that the flow rate of waste water through the waste trap 1 10 would be reduced significantly before the chamber 116 becomes filled with debris. The collection of debris in the chamber 116 would therefore be noticeable because of a reduction in the flow rate of waste water out of the sink, thereby indicating that the waste trap 110 requires emptying.

[0055] When it is desired or required to empty the waste trap 110, the closure element 122 is removed and the collected debris is accessed by way of the disposal opening 120. It will be observed that the dimension (diameter) of the disposal opening is large in relation to the chamber 116 whereby to enable the insertion of fingers and / or tools to remove the collected debris.

[0056] In this embodiment the strainer 126 is a permanently mounted part of the waste trap 110, specifically of plastic and integral with other parts of the waste trap 110. In another embodiment the strainer is of metal and is welded or adhered in the chamber.

[0057] In the embodiment of Fig.1 (and similarly in other embodiments) the inlet connector 1 12 and the outlet connector 114 are both female connectors and are therefore designed to be connected to respective male connectors (not shown) on adjacent parts of the drainage network. Clearly, in other embodiments one or both of the inlet and outlet connectors can be male connectors. In yet other embodiments the inlet and outlet do not have dedicated connectors and are instead designed to be permanently installed in a drainage network, for example by welding or adhering to adjacent components. Also, in the embodiment of Fig.1 (and similarly in other embodiments) the inlet connector is at the top, the outlet connector is at the bottom and the disposal opening is at the side. That configuration is not necessary, however, and other configurations can also be provided, for example as shown in Fig .6.

[0058] The waste trap may have an integrated U-bend, the U-bend creating a low point for waste water to provide a water seal. In such an alternative configuration the outlet connector would preferably be provided at the side of the waste trap, the waste trap having one or more partitions to direct waste water through the strainer and then through the U-bend before passing to the outlet.

[0059] The second embodiment of waste trap 210 is shown in Fig.3. This embodiment differs from the first embodiment in having two inlet connectors 212 and 230. The waste trap 210 can thereby be used below a kitchen sink for example, with the inlet connector 210 connected to the plughole of the sink and the inlet connector 230 connected to the waste water outlet of a dishwasher for example.

[0060] The inlet connector 212 and the inlet connector 230 are connected to the chamber 216 upstream of the strainer 226 so that the strainer can capture debris in the waste water entering through each of the inlet connectors.

[0061] It will be understood that further embodiments can include three, four or more inlet connectors as desired, with the size and structure of each inlet connector being matched to each particular source of waste water. Also, a T-piece or Y-piece can be connected upstream of the inlet connector 212 and / or 230 whereby waste water from two separate sources can be combined before passing to the waste trap.

[0062] The other parts of the second embodiment 210 are similar to the other parts of the first embodiment 1 10 and the description of those other parts will not be repeated.

[0063] Fig.4 shows a third embodiment of waste trap 310 having a strainer 326 which is of similar structure and function to the strainers 126, 226 of the earlier embodiments. In this embodiment, however, the strainer 326 is a primary strainer and the chamber 316 contains another, secondary, strainer 332.

[0064] The secondary strainer 332 is removably mounted in the chamber 316 and has a bowl 334 into which waste water passes. The sides of the bowl 334 are solid but the bottom of the bowl has multiple holes 330 as better seen in the plan view of Fig.5.

[0065] The primary strainer 326 is identical to the strainer 126 of the embodiment of Fig .1 . Also, the multiple holes 330 are similarly-sized to the holes 130, but that is not necessarily the case and in other embodiments the holes in the secondary strainer 332 can be smaller or larger than the holes in the primary strainer 326.

[0066] The bowl 334 of the secondary strainer 332 is connected to a flange 340 which is of circular cross-section and spans the circular disposal opening 320. The flange 340 reduces the likelihood that waste water and debris will pass into the disposal opening 320 and lie against the closure element 322, and which might cause waste water leakage when the closure element 322 is removed. The periphery of the flange 340 can carry a seal if desired, although a close sliding fit between the flange 340 and the disposal opening 320 is expected to be sufficient to prevent significant unwanted leakages.

[0067] The flange 340 is connected to a handle 342. The disposal opening 320 is lengthened over the earlier embodiments to accommodate the handle 342.

[0068] As will be seen from Fig.5, the bowl 334 has a curved distal end, the curvature closely matching the curvature of the wall of the chamber 316. The bowl 334 can therefore be positioned inside the chamber 316 and will substantially span the chamber as shown in Fig.4 (Fig .4 shows an artificially large gap between the distal end of the bowl 334 and the chamber wall for clarity).

[0069] The secondary strainer 332 is therefore located upstream of the primary strainer 326 and waste water entering through the inlet connector 312 (and all other inlet connectors if there are multiple inlet connectors) enters the bowl 334 and passes through the holes 330 before passing through the primary strainer 326. Debris in the waste water will thereby be captured by the secondary strainer 332 and will collect in the bowl 334.

[0070] The debris collected in the bowl 334 may be removed by opening the closure element 322, grasping the handle 342 and pulling the secondary strainer 332 out through the disposal opening 320. The secondary strainer 332 can be carried to a waste bin for example and inverted to empty the collected debris. Whilst the closure element 322 is removed the user can also clear debris from the primary strainer 326, specifically debris which has passed the secondary strainer 332 and been captured by the primary strainer.

[0071] The provision of a secondary strainer 332 which is removably mounted in the chamber 316 enables the use of a smaller disposal opening 320 and consequently a smaller closure element 322. This can be advantageous in locations where access is limited and a larger closure element (such as that of the first or second embodiment) might be awkward to remove. It is therefore likely that a tool will be required to remove debris collected by the primary strainer 326, but that should not be problematic as the volume of debris which passes the secondary strainer and is captured by the primary strainer 326 will likely be relatively small.

[0072] Figs. 6 and 7 show a fourth embodiment of waste trap 410. This embodiment has certain differences over the earlier embodiments which are described in detail below. It will be understood that some or all of the different features may be incorporated in the earlier embodiments where compatible, and similarly some of the different features may be omitted without departing from the invention.

[0073] The first difference is that the outlet connector 414 is at the side of the chamber 416 as viewed (the orientation as viewed being the preferred orientations of use of the various embodiments). The strainer 426 is therefore also at the side of the chamber 416. Locating the outlet connector 414 at the side of the chamber enables the disposal opening 420 to be at the bottom of the chamber.

[0074] The second difference is that the closure element for the disposal opening is incorporated into a removable chamber insert 450. The chamber insert 450 is better seen in the perspective view of Fig.7 (which is of slightly reduced scale as compared to Fig.6) and generally comprises a cylinder with a closed bottom end and an open top end. The closed bottom end is part of a well in which debris is collected in use.

[0075] The chamber insert 450 has a recess 452 in its side wall, which recess is aligned with the strainer 426 and outlet connector 414 in the assembled condition of Fig.6. Accordingly, in use waste water enters through the inlet connector 412 and leaves through the strainer 426 and outlet connector 414. Debris which cannot pass through the strainer 426 remains in the chamber 416 and typically falls into the well at the bottom of the removable chamber insert 450.

[0076] The chamber inset 450 also has a hole 454 in its side wall, which hole is aligned with the further inlet 430 in the assembled condition of Fig.6.

[0077] The removable chamber insert 450 has a peripheral flange 456, which flange 456 can be engaged by a screw collar 460 and secured to the remainder of the waste trap 410. The screw collar 460 is shown loose in Fig.6 and is not shown in Fig.7. Importantly, the screw collar 460 can rotate around the chamber insert 450 so that the chamber insert remains aligned in the waste trap 410 as the collar 460 is tightened. The chamber insert 450 can have an alignment key or keys to ensure that it can only be fitted to the remainder of the waste trap 410 in the correct alignment.

[0078] Whilst a small gap is shown between the outside of the chamber insert 450 and the inside of the chamber 416, that is for the purposes of clarity and in practice the chamber insert would preferably be a close sliding fit in the chamber. It is not, however, expected to be necessary to provide a seal between the chamber insert and the chamber as the volume of water which will enter into the gap between those components is small and can readily be collected when the chamber insert is removed.

[0079] When it is desired to dispose of the collected debris the screw collar 460 is released and the chamber insert 450 is removed. The collected debris (and the waste water which will remain in the well of the chamber insert) are disposed of. With the chamber insert 450 removed, access can be obtained to the strainer 426 in order to remove any debris which is stuck to, or adjacent to, the strainer.

[0080] A third difference is that (unlike the second embodiment of Fig.3) the further inlet 430 does not have a threaded connector. Instead, the further inlet 430 has regions of increased diameter and is configured to receive the end of a flexible hose, for example the waste water outlet of a dishwasher. Clearly, the form of the inlets and outlets, and the presence or absence of specific connectors, does not form a part of the invention and can be modified as desired for all of the embodiments described.

[0081] The fourth embodiment can be modified to incorporate a removable secondary strainer similar to that of Figs. 4 and 5. In particular, the inlet opening 430 can be replaced (or supplemented) by a (secondary) disposal opening and a (secondary) closure element similar to those shown in Fig .4.

[0082] Fig.8 shows a fifth embodiment of waste trap 510, suited to the drainage outlet of a shower. The floor of the shower is represented by the line 562 and it will be understood that most of the waste trap 510 is located below the floor 562 and in typical fashion is only accessible from above.

[0083] In known fashion, the drainage outlet has a removable cover plate 564. In this embodiment the removable cover plate 564 is solid and is held away from the floor 562 whereby waste water can pass underneath the periphery of the cover plate 564 and into the drainage outlet. In other embodiments some or all of the cover plate can be perforated. The drainage outlet has a removable sleeve 566. Waste water enters the drainage outlet through the centre of the sleeve 566, passes underneath the bottom end of the sleeve 566 and through the outlet 514. It will be seen that the bottom end of the sleeve 566 lies below the outlet 514 so that the sleeve 566 provides a water trap to prevent odours in the drainage network entering the premises.

[0084] A primary strainer 526 is located at the outlet 514. In this embodiment the primary strainer 526 is permanently mounted but in other embodiments may be removable. The sleeve 566 is removable so as to allow access to the strainer 526 for removing collected debris as required.

[0085] A removable secondary strainer 532 rests upon the sleeve 566. The secondary strainer has solid lip 570 which overlies a part of the top end of the sleeve 566, a solid peripheral wall 572 and a perforated base 574. The perforations in the base 574 may for example match the size and array of the holes 130 in the strainer 126 of the first embodiment.

[0086] It is arranged that the numerous small holes, slots and / or other openings in the base 574 capture much of the solid debris which enters the drainage outlet. When it is desired to dispose of the collected debris the cover 564 is removed and the secondary strainer 532 is lifted out of the sleeve 566 and taken to a waste bin or the like for the disposal of the collected debris. If desired, the sleeve 566 is also lifted out and collected debris is removed from the primary strainer 526.

[0087] It will be understood that the chamber insert of the fourth embodiment can if desired be fitted with an internal sleeve to provide an integrated water trap if desired.

[0088] The outer periphery of the closure element 122, 322 and of the screw collar 460 is preferably knurled or ridged to increase the grip which a user can apply by hand. It is therefore preferable that the closure element and screw collar can readily be removed by the user without the use of tools, although the use of tools is not precluded. Also, it is arranged that the seal 124 (and the similar seals of the other embodiments) prevents leakage of waste water past the closure element when the closure element has been fitted (and tightened) by hand.

Claims

CLAIMS1 . A waste trap for a drainage network, the waste trap having an inlet, an outlet and a chamber between the inlet and the outlet, the chamber having a disposal opening with a removable closure element, the waste trap having a strainer which spans a part of the chamber.

2. The waste trap according to claim 1 having a plurality of inlets.

3. The waste trap according to claim 2 in which the cross-sectional dimension of one of the inlets differs from the cross-sectional dimension of another of the inlets.

4. The waste trap according to claim 2 or claim 3 in which the structural form of one of the inlets differs from the structural form of another of the inlets.

5. The waste trap according to any one of claims 1 -4 in which the or each inlet has an inlet connector for connection to a part of the drainage network.

6. The waste trap according to claim 5 in which the inlet connector comprises a screw fitting.

7. The waste trap according to any one of claims 1 -6 having a single outlet.

8. The waste trap according to any one of claims 1 -7 in which the outlet has an outlet connector for connection to a part of the drainage network.

9. The waste trap according to claim 8 in which the outlet connector comprises a screw fitting.

10. The waste trap according to any one of claims 1 -9 in which the strainer is located at or adjacent to the outlet.1 1. The waste trap according to any one of claims 1 -10 in which the strainer is permanently mounted in the waste trap.

12. The waste trap according to any one of claims 1 -10 in which the strainer is removable from the chamber.

13. The waste trap according to any one of claims 1 -10 having a primary strainer and a secondary strainer.

14. The waste trap according to claim 13 in which the secondary strainer is removable and is located upstream of the primary strainer.

15. The waste trap according to claim 13 or claim 14 in which the secondary strainer spans all or a large part of the chamber.

16. The waste trap according to any one of claims 13-15 in which the secondary strainer comprises a bowl with a perforated base.

17. The waste trap according to claim 16 in which the bowl is connected to a flange.

18. The waste trap according to claim 17 in which the secondary strainer is configured to fit in the chamber with the flange located in the disposal opening.

19. The waste trap according to claim 18 in which the flange substantially spans the disposal opening.

20. The waste trap according to any one of claims 17-18 in which the flange is connected to a handle.

21. The waste trap according to claim 20 in which the secondary strainer is configured to fit in the chamber with the handle located in the disposal opening.

22. The waste trap according to any one of claims 13-19 in which the secondary strainer is removable by way of the disposal opening.

23. The waste trap according to any one of claims 1 -22 having a body in which all or part of the chamber is located, the body having a first end, a second end and a side wall between the first end and the second end, in which the inlet is at the first end, the outlet is at the second end and the disposal opening is at the side wall.

24. The waste trap according to claim 23 in which the strainer is aligned with the inlet and the outlet.

25. The waste trap according to any one of claims 1 -22 having a body in which all or part of the chamber is located, the body having a first end, a second end and a side wall between the first end and the second end, in which the inlet is at the first end, the outlet is at the side wall and the disposal opening is at the second end.

26. The waste trap according to claim 25 in which the strainer is at the outlet.

27. The waste trap according to claim 25 or claim 26 having a chamber insert which is removably mounted in the body.

28. The waste trap according to claim 27 in which the chamber insert is removable by way of the disposal opening.

29. The waste trap according to claim 27 or claim 28 in which the chamber insert comprises the closure element.

30. The waste trap according to any one of claims 27-28 in which the chamber insert has a side wall which extends to the outlet, the side wall having a recess aligned with the outlet.31 . The waste trap according to claim 30 in which the chamber insert has a well in which debris and waste water can collect.

32. The waste trap according to claim 31 in which the chamber insert has a water trap.

33. The waste trap according to any one of claims 27-32 in which the chamber insert has an alignment key to ensure its proper alignment with the body.

34. The waste trap according to any one of claims 27-33 in which the chamber insert is secured to the body by a threaded collar.

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