[Advanced Noiseless Check Valve]: Featuring a special spring-loaded flapper design, silent check valve effectively eliminates the water hammer noise typical of standard check valves. perfect for residential and commercial settings where noise reduction is essential. [Compatible with 1-1/2inch Pipes]: Specifically designed to safeguard against backflow, this check valve accommodates 1-1/2inch 40 pipes commonly used in sump pump and sewage pump setups. Its compact design fits snugly within a 5-1/8inch space, ensuring compatibility with installations. [Robust Connections]: The sump pump check valve boasts Buna-N couplings and 304L stainless steel clamps, ensuring a watertight seal and steadfast attachment to sump pump systems. This guarantees smooth water flow, prevents backflow, and optimizes overall pump efficiency. [Transparent Monitoring]: Equipped with transparent housing, this quiet check valve enables effortless visual inspection of its functionality, simplifying troubleshooting and maintenance tasks for swift resolution of any issues. [Easy Installation & Replacement]: The quiet sump pump check valve comes with stainless steel clamps and Buna-N rubber couplings, facilitating seamless installation without the hassle, saving time and effort. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Colour:Photo Color Material:plastic Package Contents: 1 x 1-1/2inch 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.