Durable Brass Construction - Built with heavy-duty brass and a corrosion-resistant finish to withstand high pressure (up to 150 psi) and high temperature (up to 240°F), ensuring long service life
Automatic High-Capacity Air Release - Effectively vents unwanted air from hydronic systems, reducing noise and improving circulation efficiency throughout the heating system
Serviceable Threaded Top Cap - The vent cap is threaded for easy removal, allowing for cleaning and maintenance without replacing the entire unit
Bubble Breaker Mechanism - Integrated internal baffle design breaks up microbubbles and helps collect air for faster, more effective venting
Wide Range of Applications - Ideal for use in residential and commercial heating systems including radiators, radiant floor heating, and small heaters—compatible with most 1/8” NPT fittings
Description
The 400-4 Float Air Vent Valve is a high-quality automatic air vent designed for hydronic heating systems. Featuring a durable brass body with a corrosion-resistant nickel-plated finish, it efficiently removes trapped air from hot water radiators, baseboards, convectors, radiant heating panels, and small unit heaters. With a 1/8-inch NPT connection, a maximum working pressure of 150 psi, and a temperature rating of up to 240°F, this vent ensures optimal heating performance. Its threaded cap allows for easy access and cleaning during routine maintenance.