Caleffi NA502640A

Caleffi NA502640A is a Plumbvent 1/2 inch NPT low lead air vent with hygroscopic cap designed for dependable air removal in hydronic systems. This compact, brass body vent delivers automatic venting, helping to reduce air lock, improve heat transfer, and boost boiler efficiency in residential or light commercial setups.

With the hygroscopic cap, the vent remains self-contained and resistant to humidity, ensuring steady operation and long service life. The 1/2 inch NPT connection provides a flexible installation option, while the low-lead construction meets modern safety standards. Use this component as part of a reliable hydronic system to maintain consistent pressure and performance.

• 1/2 inch NPT connection for versatile installation
• Low lead brass body for safety and code compliance
• Hygroscopic cap delivers consistent, automatic venting
• Durable construction resistant to corrosion and leaks
• Suitable for residential and commercial hydronic systems

Upgrade your heating circuit with a trusted air vent from Caleffi—the NA502640A combines reliability, efficiency, and ease of maintenance for steady, trouble-free operation.