The Caleffi 681503A is a pex fitting 3/8 in nominal with chrome nut for Caleffi radiator valves, 3/8 in nominal PEX. It is supplied as a service or installation component and is not a standalone valve.
Best for completing or servicing an existing Caleffi radiator valve installation.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Service and Installation Component
Supplied as a component for Caleffi radiator valves, 3/8 in nominal PEX. It is not a standalone valve.
Technical Specifications
| Product Type | Accessory |
| Connection Size | 3/8" |
| Compatibility | Caleffi radiator valves, 3/8 in nominal PEX |
| Maximum operating pressure | 150 psi (10 bar) |
| Maximum working temperature | 180 deg F |
| Series | Accessories |
Documentation
Related Products
- Caleffi 387127 : Universal Radiator Tool
- Caleffi 437516 : Compression Fitting 1/2 in Copper
- Caleffi 449010 : Manual Knob
- Caleffi 449740 : Wall-Covering Plate 40-50 mm
Frequently Asked Questions
What is Caleffi 681503A?
Caleffi 681503A is a component for Caleffi radiator valves, 3/8 in nominal PEX. It is supplied as a service or installation part, not a standalone valve.
What are the pressure and temperature limits of Caleffi 681503A?
Maximum operating pressure is 150 psi (10 bar).
What is the warranty on Caleffi 681503A?
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:
- Accessory
- Product Family:
- Connection Valves
- Series:
- Accessories
- Connection Size:
- 3/8 inch
- Compatibility:
- Caleffi radiator valves, 3/8 in nominal PEX
- Max Operating Pressure:
- 150 psi (10 bar)