The Caleffi R41660 is a 1-1/4 in MNPT union tailpiece for the Caleffi 523170A MixCal+ 5231 series high-flow thermostatic mixing valve.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
Key Features
Service Without Cutting Pipe
The union joint lets the host valve or separator drop out of the line for service or replacement - no torch, no pipe cutter.
Factory-Machined Sealing Face
Genuine Caleffi machining ensures the union face seals reliably against the matching nut and washer.
Low-Lead DZR Brass
Dezincification-resistant low-lead brass, suitable for potable water connections.
Technical Data
| Fits | Caleffi 523170A (5231 MixCal+, 1-1/4 in MNPT union) |
|---|---|
| Function | Tailpiece |
| For product line | MixCal+ (5231 Series) |
| Description | 1-1/4 in MNPT union tailpiece |
| Connection type | NPT Threaded |
| Connection size | 1-1/4 in |
| Material | DZR Low-Lead Brass |
Related Products
Frequently Asked Questions
Caleffi 523170A (5231 MixCal+, 1-1/4 in MNPT union). Match your host model number and connection size before ordering.
It creates a break point in the piping so the valve or separator can be removed for service without cutting pipe or unsoldering joints.
Yes - DZR low-lead brass suitable for potable water systems.
- Type:
- Tailpiece
- For Product Line:
- MixCal+ (5231 Series)
- Material:
- DZR Low-Lead Brass
- Connection Type:
- NPT Threaded
- Connection Size:
- 1-1/4 in
- Fits:
- Caleffi 523170A (5231 MixCal+, 1-1/4 in MNPT union)
