... valve, gas valve Material: brass Size: 1/2", 3/4", 1" Surface: brass/nickel plate Automatic air vent valve, brass air release valve ... , gas valveMaterial: brassSize: 1/2", 3/4", 1"Surface: brass/nickel platedModel ... develop together!welcome to send us inquiry for further cooperation! Automatic Air Vent Valve Brass Air Release Valve