Transparent body for clear visibility The transparent housing lets you see water movement, giving you confidence that water flows smoothly, pipes remain free of obstacles, and the pump operates as it should. Outstanding backflow protection Protects your system by preventing pumped water from returning to the sump basin. This removes the risk of inefficient double pumping, helps extend sump pump life, and supports a durable, reliable sanitation setup. Quiet performance design The spring-loaded flap design minimizes water hammer noises common with many check valves, making it well suited for quiet spaces such as bedrooms and other living areas. Precise and easy installation Designed to fit a 1-1/2 Schedule 40 pipe and to integrate smoothly into your existing plumbing. Its compact form requires only a 5-1/8 inch clearance, ensuring a secure fit with minimal installation effort. Specifications and compatibility Fits 1-1/2 Schedule 40 pipe Transparent body for visual confirmation Spring-loaded flap for quiet operation Clearance requirement: 5-1/8 inches Applications Basement sump pump setups to prevent backflow and verify flow Utility rooms, laundry areas, or crawl spaces where backflow protection is needed Quiet spaces (eg, bedrooms) where minimizing pump noise is important