Short test pipe sealing cushion with bypass for shutting off and testing pipes during leak tests in accordance with EN 1610 using air or DWA-A 139, as well as oil and petrol separator tests in accordance with DIN 1999. The test sealing cushion has a bypass (open passage) into the shut-off area for connecting leak testing equipment. A pipe sealing cushion (type HU) is also required to shut off the pipeline on the other side. - Flexible, lightweight design especially for house connections - With bypass for connecting leak testing equipment - NW 5 compressed air quick-release coupling for filling - Internal compressed air coupling (in the test chamber) for connecting a push rod - Suitable for pipe inner diameters of 80-150 mm - Operating pressure 2.5 bar - Made of natural rubber with fabric insert