1.Size:inch 1/2 2.Material:Brass or as you requirement. 3.ISO9001,CE cetificate. 4.for solar water heater system. Using Method:Pressure Relief Valves is suitable for bearing the pressing type solar water heater,gas heater,electric heater,water heater for fuel,water heater of heat pump,sensitive function heater,etc.various kinds of heaters,air and supply hot system of reduce pressure device,can ...