Caleffi NA502640A 1/2" NPT Low Lead Automatic Air Vent with Hygroscopic Cap

The Caleffi NA502640A Plumbvent is a high-performance automatic air vent designed to efficiently remove air from hydronic heating and cooling systems. This low lead brass air vent features a 1/2" NPT threaded connection for easy installation on radiators, manifolds, and system piping.

Key Features:

• Low lead brass construction complies with NSF/ANSI 372 and federal/state low lead regulations for potable water applications
• Hygroscopic cap absorbs water vapor while allowing air to escape, preventing water loss and system pressure drops
• Automatic float mechanism releases trapped air without manual intervention
• 1/2" NPT male threaded connection for universal compatibility
• Operating pressure up to 150 PSI
• Temperature range: -20°F to 250°F
• Compact design suitable for tight installation spaces

The hygroscopic cap technology sets this air vent apart by preventing water evaporation through the vent while still allowing accumulated air to be released automatically. Ideal for use in residential and light commercial hydronic systems, radiant floor heating, baseboard heating, and closed-loop cooling applications. The low lead construction makes it suitable for potable water systems where air elimination is critical.