Description
The Weil McLain 635-100-003 Automatic Air Vent is a hydronic system component to release trapped air from closed-loop piping in HVAC systems. It features a 1/2″ FNPT connection for installation on supply or return lines in boiler-based heating systems. The part accumulated air pockets that can restrict water flow and reduce circulation efficiency. It is commonly installed in residential and light commercial boiler setups to support stable water movement through radiators or baseboard piping. By removing air from the system, it supports maintaining consistent heat distribution and reduces noise, corrosion risk, and circulation issues in hydronic heating networks.
