CP 3/4″ Male Threaded Pipe Inlet Check Valve with 3/4″ Cam Lock Female Outlet. A proven design of outstanding durability and performance, CP check valves provide high flow capacity with instant shut-off. These check valves are durable and long-lasting and made with glass-filled polypropylene material with a stainless-steel core. Low maintenance, quick pull needle stem removes any caught debris without needing to open up the check valve.