Hubsett test coupling's are designed to be an all-in-one test device. Allows the building's drain waste and vent system to be connected to the sewer line prior to the initial test. No pump or special tools are needed to use the test coupling. The test coupling will not burst under normal pressure conditions. Various ways to install test coupling connector. Test on the building and side sewer can be done seperately or at the same time. Can be tested with air or water. Easily remove the test coupling with one quick pull on the release cord; includes dome, coupling, and float. Safe to use and holds pressure everytime. Hubsett Test Coupling ABS Horizontal, black. Recommended for use on PVC or ABS pipe fittings. Test coupling for home improvement and commercial drain waste and vent systems. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.