Creates a high flow blast of water into your RV's sewer discharge pipe, cleaning the blackor gray water tanks. the 45° angle allows the water to flowup the center of the pipes and directly to the tank to help reduce unwanted odors and the clogging and helps keep sensor clean to ensure accurate reading. Attaches directly to the RV's sewer drainage pipe, so there is no need for sanitation equipment to be brought inside the RV. A vacuum breaker prevents backflow into the fresh water supply. Four-prong bayonet swivel fitting easily and securely attaches to the RV's sewer outlet; swivel lug fitting connects to your sewer hose.