The Caleffi 31554 FD is a 1 in sweat union tailpiece for Caleffi steel 548 Hydro Separator, 5495 SEP4 and 5461 DISCALDIRTMAG units, and for the 523168A MixCal+ 5231 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.
Fits 5231 Series
Matched to Caleffi MixCal+ 5231 series high-flow thermostatic mixing valves - confirm your model number before ordering.
Technical Data
| Function | Tailpiece |
|---|---|
| For product line | Hydraulic Separators, Air & Dirt Separators, MixCal+ (5231) |
| Fits | Caleffi steel 548, 5495 and 5461 separators; Caleffi 523168A (5231 MixCal+) per Caleffi NA10341 replacement-fittings table |
| Description | 1 in sweat union tailpiece |
| Connection type | Sweat |
| Connection size | 1 in |
Related Products
Frequently Asked Questions
Caleffi steel 548, 5495 and 5461 separators; Caleffi 523168A (5231 MixCal+) per Caleffi NA10341 replacement-fittings table. 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.
- Type:
- Tailpiece
- For Product Line:
- Hydraulic Separators, Air & Dirt Separators, MixCal+ (5231)
- Connection Type:
- Sweat
- Connection Size:
- 1 in
- Fits:
- Caleffi steel 548, 5495 and 5461 separators, Caleffi 523168A (5231 MixCal+) per Caleffi NA10341 replacement-fittings table
