Caleffi 502343A Air VentCaleffi 502343A is a high capacity 1 2" NPT M air vent designed for the 548 Series, delivering reliable automatic air removal in HVAC systems. Built to endure demanding applications, this air vent helps prevent air pockets, improves heat transfer, and supports efficient system operation across hydronic heating, radiant flooring, and cooling setups. 1 2 in NPT M connection for easy installation and secure mounting High capacity venting for rapid air

making it ideal for mixed control circuits and safety interlocks

while the seal and connectors ensure a secure

and 25% elongation—this tubing provides durability while remaining easy to form in tight spaces

helping prevent scalding and temperature swings

Choose the Baso H91BA-3C for durable

It’s an ideal solution for maintaining optimal fuel-air mix and safer operation in Carlin burners

NEMA enclosure rating: 1/2/3/3S/4/4X

supporting safe handling and minimizing spill risk

closed position on power loss

with a 7/16 inch terminal connector to fit common control boards and ignition assemblies

Designed for hot and chilled water applications

Designed for easy installation and reliable control