Fangrui Product Details Quiet Operation Strategy: In The Peaceful Sound Of Silence Thanks To The Spring-loaded Flapper Design On Our Sump Pump Check Valve. It Strategically Eliminates The Water Hammer Noise Most Check Valves Generate, For Environments Where Tranquility Is Prized Such As Bedrooms Or Basements. Smart Visibility Execution: The Transparent Body Of This Check Valve Is More Than Just A Sleek Design Choice. It Provides Clear Visibility Into The Water Movement, Giving You Peace Of Mind That The Water Is Flowing Smoothly, Pipes Are Free Of Obstructions, And The Pump Is Operating Optimally. Precise And Hassle-free Installation: Designed To Be A Match For A 1-1/2inch Schedule 40 Pipe, This Check Valve Can Smoothly Integrate Into Your Current Plumbing Setup. Its Compact Design Requires Just A 5-1/8inch , Ensuring A Snug Fit With Minimal Installation Effort Required. Exceptional Backflow Protection: The Of Your System By Preventing Pumped Water From Receding Back Into The Sump Basin. This Eliminates The Risk