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Hoffman #75 1/2" x 3/4" Straight Steam Unit Heater Air Valve. Part 401434 Maximum operating pressure: 3 psig (0.2 bar) (Drop away pressure - maximum pressure against which the vent can open). Maximum pressure 15 psig (1.0 bar)
Hoffman #75 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