The Caleffi NA10404 is a union nut with a 1 in press connection for Caleffi small union valves products, providing the union joint that lets the host valve or separator be installed and removed without cutting pipe.
Product data compiled from Caleffi North America technical documentation. Last reviewed July 2026.
Key Features
Genuine Union Nut
Correct thread form and depth for the matching Caleffi union tailpiece and body.
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
| Function | Union Nut |
|---|---|
| For product line | Small Union Valves |
| Description | 1 in Press Tailpiece for 1 in Slip Nut |
| Connection type | Press |
| Connection size | 1 in |
| 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
Presscon Series BrochureRelated Products
Frequently Asked Questions
It is the genuine fitting for Caleffi Small Union Valves products. Match your host model number and connection size before ordering.
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:
- Union Nut
- For Product Line:
- Small Union Valves
- Connection Type:
- Press
- Connection Size:
- 1 in