Automatic Air Vent, Brass, 3/4 x 1/2 In. Price For: Each Material of Construction: Brass Max. Temp. (F): 240 Degrees Item: Automatic Air Vent Inlet: 3/4" MNPT, 1/2" FNPT Width (In.): 2-1/4 Max. Working Pressure (PSI): 150 Height (In.): 4-3/4 Country of Origin (subject to change): China