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Brass automatic air vent with 1/8 inch NPT male thread

Caleffi

Caleffi 502610A Automatic Air Vent 1/8" NPT Male

SKU CH-0D2Z-17HZD

Automatic air vent with 1/8" NPT male connection releases trapped air from hydronic systems

  • Automatically removes trapped air from hydronic systems
  • 1/8" NPT male thread fits standard piping connections
  • Caleffi brand delivers proven hydronic component reliability
  • Compact design installs easily in tight RV spaces
  • First listed by manufacturer on April 29, 2023

Automatic Air Vent 1/8" NPT

The Caleffi 502610A is an automatic air vent designed for hydronic heating and cooling circuits. It connects via a 1/8 inch NPT male thread to release trapped air without manual intervention. This component suits installers and maintenance technicians working on residential or light commercial systems.

Thermals Noise and Power Draw

The vent operates passively using system pressure and a float mechanism, requiring no electrical supply. It produces no audible noise and draws zero power during normal operation. The brass body withstands typical hydronic fluid temperatures and pressures found in standard installations.

Replaces Manual Vents

This unit replaces manual bleed valves or older automatic vents that have failed or leak. The upgrade is worth it when routine air removal is needed at high points or terminal units to maintain heat transfer efficiency. It is not for systems requiring larger connection sizes or higher pressure ratings than the 1/8 inch NPT fitting provides.

Highlights

  • Automatically removes trapped air from hydronic systems
  • 1/8" NPT male thread fits standard piping connections
  • Caleffi brand delivers proven hydronic component reliability
  • Compact design installs easily in tight RV spaces
  • First listed by manufacturer on April 29, 2023

Specifications

BrandCALEFFI

Questions about this item

How do I install the 1/8" NPT male thread without cross-threading?

Start the 1/8" NPT male thread by hand until it seats squarely, then tighten with a wrench no more than two full turns past hand-tight to avoid stripping the tapered threads.

What part of the 502610A will need replacement over time?

The internal float and needle valve can collect mineral deposits; flushing the system annually and replacing the vent if it stops releasing air keeps the circuit air-free.

At what pressure does the 1/8" NPT vent stop purging air under continuous operation?

The vent is rated for typical hydronic pressures up to 10 bar; sustained pressure above that limit will keep the float seated and prevent further air release.

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