Taco 400-4 1/8" HY-VENT Hot Water Float Style Automatic Air Vent System Type: Hydronic (Water) Size: 1/8" Male NPT Material: Brass Body Pattern: Straight Application: Heating Mount: Straight Adjustability: Non-Adjustable Type: Float-Style Max Temp (F): 240°F Min Temp (F): 140°F Max Pressure: 150 psi Max Venting Pressure (PSI): 50 psi Replaces Taco 400-3