The Caleffi 502113A is a MINICAL automatic air vent with a 1/8" NPT male connection, supplied with an integral service check valve and a hygroscopic anti-drip cap. Installed at system high points, its float-operated valve automatically releases air that accumulates in heating and air-conditioning circuits.
Best for automatic air release at system high points.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Integral Service Check Valve
A check valve beneath the vent lets the float head be removed for service without draining the system.
Hygroscopic Anti-Drip Cap
Cellulose fiber discs in the cap swell on contact with water to positively seal the vent, preventing drips at the discharge.
Float-Operated Venting
As air collects in the vent body the internal float drops, opening the release valve; the valve closes automatically as the fluid level recovers.
System Protection
Continuous automatic air release helps reduce oxygen-driven corrosion, trapped-air noise in emitters and cavitation at circulator pumps.
Technical Specifications
| Function | Automatic float air vent |
| Series | Caleffi MINICAL |
| Connection | 1/8 in NPT male |
| Body material | Brass |
| Maximum operating pressure | 150 psi |
| Maximum air discharge pressure | 40 psi |
| Maximum discharge rate | 1.75 SCFM |
| Medium temperature range | 32 - 230 °F |
| Shipping Weight | 0.5 lb |
Documentation
Design Resources
Related Products
- Caleffi 502015A : MINICAL Air Vent 1/8" NPT Threaded
- Caleffi 502040A : MINICAL Air Vent 1/2" NPT Threaded
- Caleffi 502043 CST : MINICAL Air Vent 1/2" Straight Thread
- Caleffi 502043A : MINICAL Air Vent 1/2" NPT Threaded
Frequently Asked Questions
What does Caleffi 502113A do?
Caleffi 502113A is an air vent in the Caleffi MINICAL range. It automatically releases air that accumulates in the system, helping prevent oxygen-driven corrosion, trapped-air noise and pump cavitation.
What connection does Caleffi 502113A use?
It is supplied with a 1/8" NPT male connection. Other sizes and connection styles in the MINICAL range are listed under Related Products.
What are the pressure and temperature limits of Caleffi 502113A?
Maximum operating pressure is 150 psi, over a medium temperature range of 32 - 230 °F.
What is the warranty on Caleffi 502113A?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Type:
- Air Vent
- Series:
- MINICAL
- Connection Type:
- NPT Threaded
- Connection Size:
- 1/8 in
- Service Check Valve:
- Included
- Max Operating Pressure:
- 150 psi
- Medium Temperature Range:
- 32 - 230 deg F
- Body Material:
- Brass
