Hoffman 75H, 1/2" x 3/4" Straight Steam Main Air Valve

Air Valve (non-vacuum) Float-type thermostatic vent For medium and large systems Single non-adjustable port 1⁄2" NPT female and 3⁄4" NPT male straight shank Maximum operating pressure 10 psig (0.7 bar)(Drop away pressure - maximum pressure against which the vent can open). Maximum pressure 15 psig (1.0 bar)