Direct water flow through your irrigation system with the PVC Swing Check Valve, 1-1/4 in. IPS S X S. Water is conveyed one-way through the valve when the flap opens. This leak-resistant valve connects two 1-1/4 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. Flapper is made of EPDM. Use fittings and other valves to set up a new irrigation system, expand an existing system, or make repairs.