Hoffman 4, 1/2" x 3/4" Straight Steam Quick Valve

Quick Valve Thermostatic air vent For steam systems and process equipment Operates on temperature change only; does not close against water Must be installed 6-10" (150-250mm) above horizontal return and 18" (450mm) above the boiler water line 1⁄2" NPT female and 3⁄4" NPT male straight shank Maximum operating pressure 25 psig (1.7 bar)*(Drop away pressure - maximum pressure against which the vent can open).) Maximum pressure 25 psig (1.7 bar)