Hoffman Steam Air Vent 401422 1A, 1/8" Adjustable Angle Steam Radiator Air Valve - 3 Pack Air Valve (non-vacuum) - Float-type Vent Adjustable Port For True Proportional Venting V 6 Port Settings From Slow (1) To Fast (6) 1/8" NPT Angle Connection Maximum Operating Pressure 1 1/2 PSIG(0.1 bar) Get All 3 - Great Value Pack