Usage Tips:QUIET OPERATION: Our sump pump check valve has a spring-loaded flapper that helps 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: provides sump pump systems that help the of a sump outage and prevent costly damage. We also offer Smart Sump Pump Systems that automatically track incoming data and check that a sump pump is working properly. Colour:As Shown Material:ABS+Metal Package Contents: 1 x 2Inch Check Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.