1-1/4" PVC True Union Ball Check Valve (Gray, Slip & Threaded End Connectors included) Extra Thick Walls and Durable O-Rings To Ensure Longevity And Resistance To Leaks Rated at a full 150 PSI @ 73 F, EPDM O-Rings Socket and Threaded (FPT) End-Connectors Included to Accommodate All Work Environments, Sizes 1/2", 3/4", 1", 1-1/4", 1-1/2", and 2" Excellent for Ponds, Fountains, Irrigation, Pools & Spas and Aquariums!