1210030 - 3" PVC Union Ball Check Valve - EPDM - Socket x SocketAsahi 1210030 3" PVC Union Ball Check Valve EPDM Socket x Socket The Asahi America ball check valve employs a free moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow. It may be installed vertically or horizontally. Also available as foot valve for suction side of pump. Ideal Applications Include: Chemical processing, bleach plants, aquariums, mining, water treatment, landfills, swimming pools,