[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. 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 Various 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. [ Parent Monitoring]: Equipped With Parent Housing, This Quiet Check Valve Enables Effortless Visual Inspection Of Its Functionality, Simplifying Troubleshooting And Maintenance Tasks