QUIET OPERATION: Our sump pump check valve has a spring-loaded flapper that helps eliminate the water hammer noise that standard check valves produce. The water hammer noise occurs when the discharged water slams the check valve flapper down. This silent check valve can bring a quiet operation to your sump pump. CLEAR VALVE BODY: This check valve provide visibility to water movement. With the valve's clear body, it's easy to visually confirm that pumped contents are moving, the pipes are not clogged, and the pump in the basin is fully operational. INCLUSIONS: Our silent sump pump check valve comes with stainless steel clamps and Buna-N rubber couplings for quick installation. The clamps and couplings fit a 2inch Schedule 40 pipe. KEEP WATER OUT: This check valve is designed to keep pumped contents within the discharge pipe from falling back into the sump basin. A fully functional check valve can increase pump life expectancy by preventing contents from being pumped twice. ABOUT US: