1210010 - 1" True Union In-line Ball Check Valve - PVC, Socket/Threaded, EDPM Seal1" PVC EPDM SOC THR TU BALL CHECK VALVE ASAHI Features and Benefits Uniseat seal of EPDM or FKM Ball is the only moving part. It unseats to permit flow in one direction but seals against seat to prevent backflow. May be used vertically or horizontally Minimum shut off of 5 psi All sizes rated for full vacuum service Solid thermoplastic ball NSF 61 Certified Sizes: " 2", Material: PVC, EPDM, FKM Styles: Single Union Threaded Single Union Flanged Single