Make of brass, has a highly density, is strong and enduring and has a high resistance to mechanical damage and wear and tear The valves can be used both in a house and in an apartment as well as in most commercial rooms in areas such as industry, sanitary, heating If, on the other hand, the pressure in the boiler rises on the set value when heating water for any reason, the water heater pressure relief valves as a valves dissipates the required water, serious disturbances and dangerously overpressure Our brass valves has the function of both a check valves and a pressure relief valves. On the a hand, it is a check valves that prevents the hot water from flowing back from the boiler into the cold water circuit The dimensions are 1/2inch male thread and 1/2inch female thread. Brass valves automatically releases excess pressure to water heater explosions, Manufacturer: Oxxggkao