Allow water to flow one-way through pipe with the PVC Compression Swing Check Valve, 2 in. IPS UC X UC. Water is conveyed through the valve when the flap opens. This easy-fit valve connects two 2 in. pipes in an irrigation or other pressurized system and prevents the backflow of water. Prevents costly property damage, pipe corrosion, and system issues. Durable check valve is made of PVC plastic. Buna-N Gasket is made of nitrile rubber. Flapper is made of EPDM. Use fittings and other valves to set up a new irrigation system, expand an existing system, or make repairs.