The CiBi Silent Check Valve is designed for use with 1 1/2" Schedule 40 pipe and features a spring-loaded flapper to prevent the loud water hammer sound that other check valves can produce. The valve's transparent body allows for easy visual inspection, so you can confirm that water is flowing properly and the system is functioning as expected. It also prevents water from flowing back into the sump basin, ensuring efficient pump performance. This package includes the check valve, two rubber couplings, and four stainless steel clamps for secure installation. Designed for compatibility with 1 1/2" Schedule 40 pipes, the valve fits within a 5-1/8" space.