The Xylem-Hoffman Specialty 401488 79 water vent is a vital component designed to release air trapped in hydronic heating systems. Placed atop radiators or high spots, this vent lets built-up air out, guaranteeing ideal water circulation and avoiding air pockets that could impair system efficiency. It allows up to 75 pounds of pressure per square inch and works with a variety of HVAC and plumbing systems thanks to its 1/2-inch female and 3/4-inch male connections.

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https://www.partshnc.com/79-h2o-vent-12f-34m-75-max-for-xylem-hoffman-specialty-part-401488