Air Vent Valve; Type Float, Thermostatic; Inlet Size 1/2 Inch and 3/4 Inch; Inlet Connection Female Threaded and Male Threaded Straight Shank; Port Type Non-Adjustable; Pressure Rating 3 PSIG (Operating), 15 PSIG (Maximum); Media Handled Steam, Air; Application Medium and Large System; Overall Dimension 2-1/2 Inch Width x 5-3/4 Inch Height