Hoffman 74, 1/2" x 3/4" Straight Steam Unit Heater Air Valve

Steam Unit Heater Air Valve Float-type thermostatic vent Single non-adjustable port 1⁄2" NPT female and 3⁄4" NPT male straight shank Install 6-10" (150-250mm) above horizontal return and 18" (450mm) above the boiler water line Maximum operating pressure 35 psig (2.4 bar)*(Drop away pressure - maximum pressure against which the vent can open). Maximum pressure 35 psig (2.4 bar)