Automatic air vent valve, brass air release valve, gas valve Material: brass Size: 1/2", 3/4", 1" Surface: brass/nickel plate Automatic air vent valve, brass air release valve ... /2", 3/4", 1"Surface: brass/nickel platedModel: ART.1004Our company professional in producing all series of brass air vent valves, brass release valves, brass safety valves which widely ...