A device for sealing and inflating motor vehicle tires, wherein the device has, in a housing, a compressor which is driven by a motor, preferably an
electric motor, and which serves for generating the sealing or
pump pressure, and the device has a connector for a
sealant container, a valve and
distributor unit for
sealant and pressurized gas, and furthermore connecting means such as hoses and lines, and also switching, control and display devices for the operation of the device, wherein the device furthermore comprises a manually actuatable pressure
discharge valve for decreasing the
tire pressure, wherein the pressure
discharge valve is configured such that, when the
sealant container is connected and / or during the delivery of sealant from the sealant container into the tire, an actuation, or a dissipation of the pressure, is prevented.