Camco's Rhino Blaster Pro RV Holding Tank Rinser creates a high flow blast of water into your RV's sewer discharge pipe, cleaning the black or grey water tanks. The 45° angle allows the water to flow up the center of the pipes and directly to the tank. The gate valve allows you to backfill and flush black and grey water tanks, then reverse the valve and flush the sewer drain hose. The high flow rate allows for rapid tank flushing. It attaches directly to the RV's sewer drainage pipe so there is no need for sanitation equipment to be brought inside the RV or brought back out after use. The vacuum breaker prevents backflow into the freshwater supply. It includes a 4-prong bayonet fitting that easily and securely attaches to the RV's sewer outlet, and a swivel lug fitting to connect to your sewer hose. The clear elbow allows you to see when the water runs clear.