The Caleffi NA16266LC is a long copper press union tailpiece with a 1 in press connection, a 1 in brass union slip nut and an integral check valve, for Caleffi 1 in union fittings.
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.
Presscon Leak-Detection O-Ring
Special EPDM O-ring slots weep during an unpressed system test, then seal completely when pressed - unpressed joints reveal themselves before insulation goes on.
Standard Press Tools, 200 psi
Presses with standard compression jaws; rated 200 psi, 0 - 250 F, up to 50% glycol.
Technical Data
| Check valve | Integral |
|---|---|
| Sealing washer | Required; not included |
| Function | Tailpiece |
| For product line | Small Union Valves |
| Description | 1 in long press tailpiece with 1 in brass union slip nut and check valve |
| Connection type | Press |
| Connection size | 1 in |
| Material | Brass |
| Press system | Caleffi Presscon, standard press compression tools |
| Press rating | 200 psi; 0 - 250 F; up to 50% glycol |
| Insertion depth | 7/8 in (mark tube before pressing) |
| Lead-law compliance | Meets U.S. and Canadian low-lead requirements |
Documentation
Instruction sheetRelated Products
Frequently Asked Questions
Small Union Valves. 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.
Standard press compression tools and jaws - see the Presscon installation guide; insert the tube fully to the 7/8 in depth and mark before pressing.
The EPDM O-ring has special slots that let fluid weep past an unpressed joint during system testing, so a missed press shows up immediately; once pressed, the joint seals completely.
- Type:
- Tailpiece
- For Product Line:
- Small Union Valves
- Material:
- Brass
- Connection Type:
- Press
- Connection Size:
- 1 in
- Check Valve:
- Integral
- Sealing Washer:
- Required, not included
- Press System:
- Caleffi Presscon, standard press compression tools
- Press Rating:
- 200 psi, 0 - 250 F, up to 50% glycol
- Insertion Depth:
- 7/8 in (mark tube before pressing)
- Lead-Law Compliance:
- Meets U.S. and Canadian low-lead requirements
