For RV's with enclosed sewer compartments. Patented bypass allows worry-free grey water emptying without turning pump on. Eliminates constant monitoring of grey tank. Connects to RV valve via 24" long by 3" diameter flexible inlet hose. Permanent install ready when needed. Hard wire to a 20-amp dedicated circuit. Includes space-saving 21' long x 1" diameter sewer hose (retracts to 7'), universal nozzle with cap and wiring kit.