The Caleffi 502115A is a MINICAL air vent with 1/8" NPT Threaded connections. Installed at system high points, its float-operated valve automatically releases accumulated air, and an integral check valve allows service without draining the system.
Best for automatic air release at system high points.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
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.
Integral Service Check Valve
A check valve beneath the vent lets the float head be removed for service without draining the system.
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 |
| Service check valve | Included |
| 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 502115A do?
Caleffi 502115A 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 502115A use?
It is supplied with 1/8" NPT Threaded connections. Other sizes and connection styles in the MINICAL range are listed under Related Products.
Does Caleffi 502115A include a service check valve?
Yes. An integral check valve beneath the vent allows the float head to be removed for service or replacement without draining the system.
What are the pressure and temperature limits of Caleffi 502115A?
Maximum operating pressure is 150 psi, over a medium temperature range of 32 - 230 °F.
What is the warranty on Caleffi 502115A?
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
