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Hoffman 401413 # 4A Steam Vent 3/4" Male Or 1/2" Female Connection Model 4A Part No.401413 Air Valve (non-vacuum) Specifications: Float-type thermostatic vent For residential or small one-pipe or two-pipe systems 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 2 psig (0.13 bar)* Maximum pressure 10 psig (0.7 bar)
