Quiet Operation: the sump pump check valve has a distinctive spring loaded flapper that helps take away the water hammer noise that standard check valves produce; The water hammer noise occurs when the discharged water slams the check valve flapper down; Experience a quiet sump pump operation with this check valve's distinctive spring loaded flapper; Ideal for bedrooms, basements, or any area where noise reduction is crucial Transparent Valve Body for Visibility: the clear body of this check valve provides visibility to water movement; Easily confirm that the pumped contents are flowing smoothly, pipes are clear of obstructions, and the sump pump in the basin is functioning optimally; A clear view ensures peace of mind and allows you to monitor your sump system effortlessly Precision Fit for Easy Installation: designed to fit a 1-1/2" schedule 40 pipe, the sump pump check valve effortlessly integrates into your existing plumbing setup; With a compact size that fits within a 5-1/8" gap, it ensures a snug fit, enjoy a hassle free installation process Prevent Water Backflow: safeguard your sump system from water backflow with this check valve; It effectively prevents pumped water from falling back into the sump basin, ensuring the pump operates efficiently and prolonging its life expectancy; Say goodbye to the risks associated with water pumping twice and maintain a reliable sump pump system Leak Free and Corrosion Resistant: the silent sump pump check valve is equipped with 304 stainless steel clamps and rubber couplings; These components are corrosion resistant and rust proof, ensuring a leak free performance; Easy to install, these durable materials provide long lasting reliability for your sump pump system