... " Material: Brass body and plastic handle Threaded ISO228/1. electric radiator valvesStructure: Brass Body, brass bonnet, brass ball, brass stem Seal ... plastic cover, brass screw cap, PVC cushion, iron inside dentation cushion Size:3/8",1/2"Testing pressure: 0.6-0.8mpa ... provide you Test Certificate and Mill Certificate if require. electric radiator valves