Spring loaded inline check valves help to prevent backflow and provide pressure relief in irrigation systems. Our high quality design provides durability and reliability through its brass construction, rubber O ring seal, and stainless steel spring. This check valve is optimal in centrifugal, jet, and submersible pump systems. Maximum pressure 200 psi. Maximum temperature 180°F. Cracking pressure or minimum pressure to open the valve is 0.863 psi. FIP x FIP ends.