Hayward SV10100STE 1-Inch PVC NPD Design True Union Solenoid Valves with EPDM Seal and Socket/Threaded End Connection NPD design true union solenoid valve with EPDM seals Made of heavy wall plastic material Features corrosion-resistant and polyester coil; gives continuous 100 percent duty applications Includes four position electrical connection and 1/2-inch conduit or S-J type cord electrical connection Pipe measures 1-inch socket/threaded end connection