Size:1 The high-capacity, float-style vent can be placedeither on the boiler or at the high points throughout the system. Withthreaded connections–.125-Inch. 0.25-Inch, 0.5-Inch and 0.75-Inch –andoperating pressure ratings up to 150 psi, these brass-body, nickel-platedvents meet the system requirements of even your largest installations. Fromthe Manufacturer The high-capacity, float-style vent can be placed either onthe boiler or at the high points throughout the system. With threadedconnections–.125-Inch. 0.25-Inch, 0.5-Inch and 0.75-Inch –and operatingpressure ratings up to 150 psi, these brass-body, nickel-plated vents meet thesystem requirements of even your largest installations.