Male side pipe fitting

Abstract

To provide a resin male side pipe joint which has no parting line, which extends traversing a bottom of a seal groove and extends vertically on a side wall of the seal groove, and enables two seal members to be attached thereto.SOLUTION: A male side pipe joint (101) includes: a cylindrical first body (1) formed of a resin material; and a second body (2) in which an axial end of the first body (1) is inserted and fixed and which is formed of a resin material. The first body (1) has a first annular protrusion (4) and a second annular protrusion (5), forming side walls of seal grooves to which annular seal members are attached, on its outer peripheral surface. One of the first annular protrusion (4) and the second annular protrusion (5) is integrated with a cylinder part (3) of the first body (1). The other is formed separately from the cylinder part (3) and fixed to an outer peripheral surface of the cylinder part (3).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a male-side pipe joint made of resin.

Background Art

[0002] Patent Document 1 describes a pipe joint for connecting pipes. This pipe joint is used, for one application, to connect refrigerant pipes that allow refrigerant to flow in a refrigerant circuit constituting a refrigeration cycle of a vehicle air conditioner.

[0003] The above pipe joint is composed of a male-side member and a female-side member. The male-side member is provided with two holding grooves for holding an O-ring. These two holding grooves are grooves with different widths, and the holding groove on the flange side is a groove with a narrower width. O-rings of the same material, shape, and size are attached to the two holding grooves. With these configurations, the O-ring on the flange side of the male-side member protrudes outward, thereby improving the sealing performance of the pipe joint.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventionally, automobile air-conditioning pipes (refrigerant pipes) and their pipe joints (pipe joints as described in Patent Document 1) are made of aluminum (metal). On the other hand, in recent years, in order to improve the fuel efficiency of gasoline vehicles and extend the driving range of electric vehicles, it has been considered to reduce the weight of automobiles by replacing metal parts such as air-conditioning pipes and their pipe joints with resin parts.

[0006] Here, if we attempt to integrally mold the male component of a pipe fitting, such as the one described in Patent Document 1, which is fitted with two O-rings, by injection molding, the following problems arise.

[0007] To allow the mold to be removed from the molded male component, the injection molding mold must be a split mold (a mold that is like a cylinder split in two along its axial direction). With such a split mold, it is impossible to avoid the formation of a parting line in the O-ring retaining groove (seal groove). When a parting line is formed, there is a possibility that gas leakage will occur from the pipe joint along that parting line. This parting line refers to the parting line that forms at the bottom or on the side wall of the retaining groove. The parting line that forms at the bottom of the retaining groove extends across the bottom of the retaining groove. The parting line that forms on the side wall of the retaining groove extends vertically along the side wall of the retaining groove. When such parting lines are formed, it is difficult to reduce the surface roughness of the bottom or side wall of the retaining groove.

[0008] The object of the present invention is to manufacture a resin male pipe fitting that can accommodate two sealing members, without parting lines that extend across the bottom of the seal groove or vertically along the side wall of the seal groove. [Means for solving the problem]

[0009] The male pipe fitting disclosed herein comprises a cylindrical first main body made of a resin material and a second main body made of a resin material into which the axial end of the first main body is inserted and fixed. The first main body has a first annular projection and a second annular projection on its outer circumferential surface that form the side wall of a seal groove into which an annular sealing member is fitted. One of the first annular projection and the second annular projection is integrally molded with the cylindrical portion of the first main body, while the other is separate from the cylindrical portion and fixed to the outer circumferential surface of the cylindrical portion. [Effects of the Invention]

[0010] With the male pipe fitting configured as described above, it is possible to manufacture a resin male pipe fitting that can accommodate two sealing members, without parting lines that extend across the bottom of the seal groove or vertically along the side wall of the seal groove. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side cross-sectional view of the male side pipe fitting of the first embodiment. [Figure 2] Figure 1 is a front view of the male side pipe fitting. [Figure 3] This diagram shows the manufacturing procedure for the first main body shown in Figure 1. [Figure 4] This is a side cross-sectional view of the male side pipe fitting of the second embodiment. [Figure 5] This is a side cross-sectional view of the male side pipe fitting of the third embodiment. [Modes for carrying out the invention]

[0012] Embodiments for carrying out the present invention will be described with reference to the drawings. The male pipe fitting of the present invention is not limited to male pipe fittings used in air conditioning piping (refrigerant pipes) for automobiles, but is a male pipe fitting that can be used for connecting various types of piping.

[0013] (First Embodiment) As shown in Figures 1 and 2, the male pipe fitting 101 comprises a first main body 1 and a second main body 2. This male pipe fitting 101 is used, for example, as a male pipe fitting among pipe fittings for connecting pipes in automotive air conditioning piping (refrigerant pipes). In this application, the female pipe fitting corresponding to the male pipe fitting 101 is not shown.

[0014] The first main body 1 is the part that is inserted into the female side pipe fitting (not shown). The first main body 1 has a cylindrical shape. The first main body 1 is composed of a cylindrical part 3, a first annular projection 4, and a second annular projection 5. The cylindrical part 3, the first annular projection 4, and the second annular projection 5 are all made of resin material. The cylindrical hole 3a of the cylindrical part 3 is a hole that serves as a flow path for the refrigerant (fluid).

[0015] The first annular projection 4 is provided on the outer circumferential surface of one axial end of the cylindrical portion 3 (the end that is inserted into the female pipe fitting). The first annular projection 4 is integrally molded with the cylindrical portion 3. The first annular projection 4 may be provided at a position slightly away from the end of the cylindrical portion 3. In other words, the position of the first annular projection 4 is not limited to the end of the cylindrical portion 3.

[0016] In contrast, the second annular projection 5 is provided on the outer circumferential surface of the cylindrical portion 3 at an intermediate point in the axial direction. The second annular projection 5 is provided at approximately the center in the axial direction between the first annular projection 4 and the receiving opening 8 of the second main body portion 2, which will be described later. The second annular projection 5 is separate from the cylindrical portion 3 and is fixed to the outer circumferential surface of the cylindrical portion 3. The second annular projection 5 is a ring-shaped component made of resin.

[0017] A first seal groove S1 is formed by the first annular projection 4, the second annular projection 5, and the outer circumferential surface of the cylindrical portion 3 between the first annular projection 4 and the second annular projection 5. An annular sealing member (not shown) is fitted into this first seal groove S1. The annular sealing member is, for example, an O-ring. The material of the O-ring is rubber or resin. The first annular projection 4 and the second annular projection 5 each form the side walls of the first seal groove S1. The outer circumferential surface of the cylindrical portion 3 between the first annular projection 4 and the second annular projection 5 forms the bottom surface of the first seal groove S1.

[0018] Furthermore, a second seal groove S2 is formed by the second annular projection 5, the receiving opening 8 of the second main body 2 (described later), and the outer circumferential surface of the cylindrical portion 3 between the second annular projection 5 and the receiving opening 8. An annular sealing member (not shown) is fitted into this second seal groove S2. The annular sealing member is, for example, an O-ring. The material of the O-ring is rubber or resin. The second annular projection 5 and the receiving opening 8 each form the side walls of the second seal groove S2. The outer circumferential surface of the cylindrical portion 3 between the second annular projection 5 and the receiving opening 8 forms the bottom surface of the second seal groove S2.

[0019] In this way, two seal grooves S1 and S2 for mounting two O-rings (annular seal members) are formed in the first main body 1. Note that no convex portion is provided on the outer peripheral surface of the end portion of the cylindrical portion 3 constituting the first main body 1 on the side opposite to the first annular convex portion 4. Although the receiving port 8 protrudes toward the first main body 1 side, the receiving port 8 does not necessarily have to protrude toward the first main body 1 side. When the receiving port 8 does not protrude toward the first main body 1 side, if the length of the cylindrical portion 3 is the same as that shown in FIG. 1, the width of the second seal groove S2 will be too wide. Therefore, when the receiving port 8 does not protrude toward the first main body 1 side, the cylindrical portion 3 is made shorter than that shown in FIG.

[0020] The second main body 2 is a so-called flange portion for firmly connecting the male-side pipe joint 101 and the female-side pipe joint so that they do not separate due to the pressure of the refrigerant or the like. The second main body 2 is composed of a main body portion 6 in which a hole 6a serving as a refrigerant flow path is formed, and a fastening portion 7 extending from the main body portion 6. The second main body 2 (the main body portion 6 and the fastening portion 7) is made of a resin material.

[0021] A cylindrical receiving port 8 into which the axial end portion of the first main body 1 is inserted and fixed is provided in the main body portion 6. The receiving port 8 protrudes toward the first main body 1 side. A cylindrical receiving port 9 into which a resin pipe 50 is inserted and fixed is provided on the surface of the main body portion 6 opposite to the receiving port 8.

[0022] The fastening portion 7 has a hole 7a into which a cylindrical collar 10 is fitted. A bolt (not shown) is inserted into the collar 10 fitted into the hole 7a. The female pipe fitting has a similar structure and is equipped with a flange portion having a hole into which a bolt is inserted. The male pipe fitting 101 and the female pipe fitting are firmly connected and fixed by the inserted bolt and nut (not shown). Note that the means of connecting the male pipe fitting 101 and the female pipe fitting are not limited to bolts and nuts. Also, depending on the position in which the male pipe fitting 101 is used, bolts and nuts may not be necessary to connect the male pipe fitting 101 and the female pipe fitting. Therefore, in the male pipe fitting 101, a portion extending from the main body portion 6, such as the fastening portion 7, may not be necessary.

[0023] The manufacturing method of the male side pipe joint 101 will be described. First, the manufacturing method of the first main body 1 will be described with reference to Figure 3.

[0024] A resin cylindrical portion 3 having the first annular protrusion 4 integrally is manufactured by injection molding (see the upper diagram in Figure 3). The cylindrical portion 3 has a shape in which only one ring-shaped protrusion, the first annular protrusion 4, is integrally formed on its outer surface. Therefore, as the mold for injection molding the cylindrical portion 3, a single cylindrical mold without a dividing surface can be used, rather than a mold that is like a cylinder split in two along its axial direction (split mold). This is because the mold can be removed from the molded product without using a pair of split molds.

[0025] When the above cylindrical mold is used, no parting lines extending in the axial direction of the cylindrical portion 3 are formed on the outer circumferential surface of the cylindrical portion 3 that forms the bottom surface of the first seal groove S1 and the bottom surface of the second seal groove S2. In other words, no parting lines extending across the bottoms of the first seal groove S1 and the second seal groove S2 are formed. Therefore, a resin cylindrical portion 3 without parting lines extending across the bottoms of each seal groove S1 and S2 can be obtained. In addition, no parting lines extending vertically (in the radial direction of the cylindrical portion 3) are formed on the side wall of the first annular projection 4. As a result, there is no concern that gas leakage will occur from the pipe joint (between the male pipe joint 101 and the female pipe joint) via the parting lines. Furthermore, the surface roughness of the bottom surfaces of each seal groove S1 and S2, and the side wall of the first annular projection 4 can be reduced, resulting in a male pipe joint 101 with excellent sealing performance.

[0026] Next, the second annular projection 5, which has been prepared separately, is fixed to the outer surface of the cylindrical portion 3. Since the second annular projection 5 is also made of resin material, the second annular projection 5 is also manufactured by injection molding using a mold.

[0027] Here, the material of the cylindrical portion 3 including the first annular protrusion 4 is a resin material that absorbs laser light. In contrast, the material of the second annular protrusion 5 is a resin material that transmits laser light. Since resin materials that absorb laser light and resin materials that transmit laser light are well known, their explanation will be omitted. Note that the material of the cylindrical portion 3 including the first annular protrusion 4 may be a resin material other than a resin material that absorbs laser light. Also, the material of the second annular protrusion 5 may be a resin material other than a resin material that transmits laser light.

[0028] The second annular projection 5 is fitted onto the outer surface of the cylindrical portion 3, and the second annular projection 5 is brought into close contact with the outer surface of the cylindrical portion 3. Then, as shown by the arrow in Figure 1, laser light is irradiated from the radially outer side of the cylindrical portion 3 toward the second annular projection 5, over the entire circumference of the second annular projection 5 (cylindrical portion 3). Note that the laser light does not have to be irradiated over the entire circumference. When the laser light is irradiated, the laser light passes through the second annular projection 5 and is absorbed by the outer surface of the cylindrical portion 3. The part of the outer surface of the cylindrical portion 3 that is irradiated with the laser light generates heat and melts. This heat is transferred to the second annular projection 5 which is in close contact with the heated part of the outer surface of the cylindrical portion 3, and the part of the second annular projection 5 that is in contact with it also melts. The molten materials then mix together. When the laser light irradiation is stopped, the temperature of the molten material decreases and the material solidifies. In this way, the second annular projection 5 is welded and fixed to the outer surface of the cylindrical portion 3 by laser light. This results in the manufacture of the first main body 1.

[0029] The second main body 2 is manufactured separately by injection molding. The material of the second main body 2 (main body 6, fastening part 7, and receiving openings 8 and 9) is a resin material that is transparent to laser light. However, the material of the second main body 2 may be a resin material other than a resin material that is transparent to laser light.

[0030] The end of the first main body 1 is pushed into the receiving opening 8 of the second main body 2, and the receiving opening 8 is brought into close contact with the outer surface of the cylindrical part 3. Then, as shown by the arrow in Figure 1, laser light is irradiated from the radially outer side of the cylindrical part 3 toward the receiving opening 8, covering the entire circumference of the receiving opening 8 (cylindrical part 3). When the laser light is irradiated, the laser light passes through the receiving opening 8 and is absorbed by the cylindrical part 3 on its outer surface. The part of the outer surface of the cylindrical part 3 that is irradiated with the laser light generates heat and melts. This heat is transmitted to the receiving opening 8 which is in close contact with the heated part of the outer surface of the cylindrical part 3, and the part of the receiving opening 8 that is in contact with it also melts. The molten materials then mix together. When the irradiation of the laser light is stopped, the temperature of the molten material decreases and the material solidifies. In this way, the second main body 2 is welded and fixed to the outer surface of the cylindrical part 3 at the receiving opening 8 by laser light. This manufactures the male side pipe fitting 101.

[0031] The method for fixing the male pipe fitting 101 to the pipe 50 is, for example, as follows. The material of the pipe 50 is a resin material that absorbs laser light. However, the material of the pipe 50 may be a resin material other than a resin material that absorbs laser light.

[0032] The end of the pipe 50 is pushed into the receiving port 9 of the second main body 2, and the receiving port 9 is brought into close contact with the outer surface of the pipe 50. Then, as shown by the arrow in Figure 1, a laser beam is shone from the radially outer side of the pipe 50 toward the receiving port 9, covering the entire circumference of the receiving port 9 (pipe 50). As a result, the male pipe fitting 101 and the pipe 50 are welded and fixed together by the laser beam.

[0033] (Second Embodiment) Figure 4 shows the male side pipe fitting 102 of the second embodiment. For the components constituting the male side pipe fitting 102 of the second embodiment, the same reference numerals are used for components that are the same as those constituting the male side pipe fitting 101 of the first embodiment.

[0034] In the male pipe fitting 101 of the first embodiment, the cylindrical portion 3 and the first annular projection 4 constituting the first main body 1 are integrally molded, while the second annular projection 5 is separate from the cylindrical portion 3. In contrast, in the male pipe fitting 102 of the second embodiment, the cylindrical portion 3 and the second annular projection 5 are integrally molded, while the first annular projection 4 is separate from the cylindrical portion 3. This difference is the difference between the male pipe fitting 101 of the first embodiment and the male pipe fitting 102 of the second embodiment.

[0035] In the male pipe fitting 102, the material of the cylindrical portion 3 is a resin material that absorbs laser light. Therefore, the material of the second annular projection 5, which is integrated with the cylindrical portion 3, is a resin material that absorbs laser light. In contrast, the material of the first annular projection 4 is a resin material that transmits laser light. As in the first embodiment, the material of the cylindrical portion 3 including the second annular projection 5 may be a resin material other than a resin material that absorbs laser light. Also, the material of the first annular projection 4 may be a resin material other than a resin material that transmits laser light.

[0036] Similar to the case of the second annular projection 5 in the first embodiment, the first annular projection 4 is welded and fixed to the outer circumferential surface of the cylindrical portion 3 by laser light.

[0037] Even if the second annular protrusion 5 is integrally molded with the cylindrical portion 3 instead of the first annular protrusion 4, a cylindrical mold without a dividing surface can be used as the injection molding mold for the cylindrical portion 3, rather than a mold that is like a cylinder split in two along its axial direction (split mold). By using two cylindrical molds without a dividing surface, the mold can be removed from the molded product. When a cylindrical mold is used, no parting line extending in the axial direction of the cylindrical portion 3 can be formed on the outer circumferential surface of the cylindrical portion 3 that forms the bottom surface of the first seal groove S1 and the bottom surface of the second seal groove S2. In other words, no parting line extending across the bottom of the first seal groove S1 and the second seal groove S2 can be formed. Also, no parting line extending vertically (in the radial direction of the cylindrical portion 3) can be formed on the side wall of the second annular protrusion 5.

[0038] (Third embodiment) Figure 5 shows the male side pipe fitting 103 of the third embodiment. For the components constituting the male side pipe fitting 103 of the third embodiment, the same reference numerals are used for components similar to those constituting the male side pipe fitting 101 of the first embodiment.

[0039] In the male pipe fitting 102 of the second embodiment, the first annular projection 4 is welded and fixed to the outer surface of the cylindrical portion 3 by laser light. In contrast, in the male pipe fitting 103 of the third embodiment, the first annular projection 4 is fixed to the outer surface of the cylindrical portion 3 by fitting. This difference is the difference between the male pipe fitting 102 of the second embodiment and the male pipe fitting 103 of the third embodiment.

[0040] In the male pipe joint 103, the first annular projection 4 has an annular engaging portion 4a on its inner circumferential surface. The engaging portion 4a is an annular projection. An annular recess 3b corresponding to this engaging portion 4a is provided on the outer circumferential surface of the end of the cylindrical portion 3. The first annular projection 4 is fixed to the outer circumferential surface of the cylindrical portion 3 by the engaging portion 4a fitting into the recess 3b.

[0041] In this embodiment as well, instead of using a mold that is like a cylinder split in two along its axial direction (split mold) as the mold for injection molding the cylindrical portion 3, a mold with two cylindrical shapes that do not have a dividing surface is used, allowing the mold to be removed from the molded product. When a cylindrical mold is used, no parting line extending in the axial direction of the cylindrical portion 3 is formed on the outer circumferential surface of the cylindrical portion 3 that forms the bottom surface of the first seal groove S1 and the bottom surface of the second seal groove S2. In other words, no parting line extending across the bottom of the first seal groove S1 and the second seal groove S2 is formed. Furthermore, no parting line extending vertically (in the radial direction of the cylindrical portion 3) is formed on the side wall of the second annular protrusion 5.

[0042] (effect) The male side pipe fittings 101, 102, and 103 are all male side pipe fittings comprising a cylindrical first main body portion 1 made of resin material and a second main body portion 2 made of resin material into which the axial end of the first main body portion 1 is inserted and fixed. The first main body portion 1 has a first annular projection 4 and a second annular projection 5 on its outer circumferential surface, which form the side wall of a seal groove into which an annular sealing member (e.g., an O-ring) is fitted. One of the first annular projection 4 and the second annular projection 5 is integral with the cylindrical portion 3 of the first main body portion 1, while the other is separate from the cylindrical portion 3 and fixed to the outer circumferential surface of the cylindrical portion 3.

[0043] With this configuration, when manufacturing the cylindrical portion 3 by injection molding, a cylindrical mold without a dividing surface can be used as the mold for injection molding the cylindrical portion 3, rather than a mold that is like a cylinder split in two along its axial direction (split mold). When a cylindrical mold is used, no parting line extending in the axial direction of the cylindrical portion 3 can be formed on the outer circumferential surface of the cylindrical portion 3 that forms the bottom surface of the first seal groove S1 and the bottom surface of the second seal groove S2. In other words, no parting line extending across the bottom of the first seal groove S1 and the second seal groove S2 can be formed. In addition, no parting line extending vertically (in the radial direction of the cylindrical portion 3) can be formed on the side wall of the first annular projection 4 or the second annular projection 5 which is integrated with the cylindrical portion 3. Therefore, it is possible to manufacture resin male side pipe fittings 101, 102, and 103 that can accommodate two sealing members, without parting lines extending across the bottom of the seal grooves or extending vertically on the side wall of the seal grooves.

[0044] Furthermore, the separate component of the first annular protrusion 4 and the second annular protrusion 5 will be manufactured separately by injection molding, requiring an additional mold. If both the first annular protrusion 4 and the second annular protrusion 5 are made as separate components, the number of required molds will increase accordingly. By making only one of the first annular protrusion 4 or the second annular protrusion 5 as a separate component, the number of molds can be reduced, thereby lowering manufacturing costs.

[0045] Here, the separate part of the first annular projection 4 and the second annular projection 5 is preferably welded and fixed to the outer surface of the cylindrical part 3 using laser light. With this configuration, the separate part of the first annular projection 4 and the second annular projection 5 can be firmly fixed to the cylindrical part 3.

[0046] Furthermore, the cylindrical portion 3 is formed of a resin material that absorbs laser light, and the separate portion of the first annular protrusion 4 and the second annular protrusion 5 is preferably formed of a resin material that transmits laser light. This configuration allows for easy welding using laser light (laser welding).

[0047] Furthermore, the second main body portion 2 is a cylindrical receiving opening 8 into which the axial end of the first main body portion 1 is inserted and fixed, and it is preferable that the receiving opening 8 protrudes toward the first main body portion 1 side, and in addition to the first annular projection 4 and the second annular projection 5, the receiving opening 8 forms the side wall of the seal groove. This makes it easier to form the seal groove.

[0048] Furthermore, the second main body 2 may be welded and fixed to the outer surface of the cylindrical portion 3 at the receiving opening 8 using laser light. This configuration allows the second main body 2 and the cylindrical portion 3 to be firmly fixed together.

[0049] Furthermore, the cylindrical portion 3 is preferably made of a resin material that absorbs laser light, and the second main body portion 2 is preferably made of a resin material that transmits laser light. With this configuration, welding with laser light (laser welding) can be easily performed.

[0050] The present invention is not limited to the embodiments described above, and it is possible to combine elements of the embodiments as appropriate or to make various modifications to the embodiments without departing from the spirit of the invention.

[0051] For example, the above embodiment can be modified as follows:

[0052] The method of fixing the separate first annular projection 4 and the second annular projection 5 to the cylindrical portion 3 is not limited to laser welding (first and second embodiments) or fitting (third embodiment). Other fixing methods include spin welding, ultrasonic welding, and vibration welding. The same applies to the method of fixing the receiving opening 8 of the second main body portion 2 to the cylindrical portion 3. The receiving opening 8 of the second main body portion 2 to the cylindrical portion 3 may be fixed by methods such as spin welding, ultrasonic welding, and vibration welding.

[0053] In the second main body section 2, the color 10 is optional. [Explanation of Symbols]

[0054] 1: First main body 2: Second main body 3: Cylinder part 4: First ring-shaped protrusion 5: Second ring-shaped protrusion 8: Underbite 101, 102, 103: Male side pipe fittings S1: First seal groove (seal groove) S2: Second seal groove (seal groove)

Claims

1. A cylindrical first main body made of resin material, The axial end of the first main body is inserted into and fixed to a second main body made of resin material, Equipped with, The first main body has a first annular projection and a second annular projection on its outer surface that form the side wall of a seal groove into which an annular sealing member is fitted. One of the first annular projection and the second annular projection is integrally molded with the cylindrical portion of the first main body, while the other is separate from the cylindrical portion and fixed to the outer circumferential surface of the cylindrical portion. The second main body is a cylindrical receiving opening into which the axial end of the first main body is inserted and fixed, and has a receiving opening that protrudes toward the first main body. In addition to the first annular projection and the second annular projection, the receiving opening forms the side wall of the seal groove. Male side pipe fitting.

2. In the male side pipe joint according to claim 1, The first annular projection and the other of the second annular projection are welded and fixed to the outer surface of the cylindrical portion by laser light. Male side pipe fitting.

3. In the male side pipe joint according to claim 2, The cylindrical portion is made of a resin material that absorbs laser light. The first annular protrusion and the other of the second annular protrusion are formed of a resin material that is transparent to laser light. Male side pipe fitting.

4. In the male side pipe fitting according to any one of claims 1 to 3, The second main body is fixed to the outer surface of the cylindrical portion by laser light at the receiving opening. Male side pipe fitting.

5. In the male side pipe joint according to claim 4, The cylindrical portion is made of a resin material that absorbs laser light. The second main body is formed of a resin material that is transparent to laser light. Male side pipe fitting.

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