Convey water to flow one-way through pipe and prevent backflow with the PVC Swing Check Valve, 1/2 in. IPS FPT X FPT. Water is conveyed one-way through the valve when the flap opens. This leak-resistant valve connects two 1/2 in. MPT pipes in an irrigation or other pressurized system. Prevents costly property damage, pipe corrosion, and system issues. Durable check valve is made of PVC plastic. Flapper is made of EPDM. Use fittings and other valves to set up a new irrigation system, expand an existing system, or make repairs.