Nibco H-36805W Press X Pex Transition Coupling 1-1/4 in

Product Description

The NIBCO H-36805W is a transition fitting coupling designed to connect press-fit copper piping systems to PEX tubing using a single inline fitting. It features a press end on one side and a PEX end on the other, with an EPDM O-ring seal for a reliable, leak-resistant connection. Rated at 250 psi cold working pressure (CWP), this coupling is built from forged DZR (dezincification-resistant) brass, making it well suited for potable water, hydronic heating, and general plumbing applications where both press and PEX systems meet. It is sized at 1-1/4 inch nominal. Licensed plumbers and hydronic system installers are the primary installers of this fitting.

This coupling is used in residential and light commercial plumbing or hydronic heating systems where a transition between a press-fit copper line and a PEX distribution line is required. Common scenarios include system retrofits, manifold connections, and branch takeoffs where copper mains feed into PEX runs. The 1-1/4 inch nominal size suits main distribution lines and larger branch circuits in multi-zone or multi-fixture installations.

Key Features

• Press x PEX end style allows direct transition between copper press systems and PEX tubing without solder or open flame
• EPDM O-ring provides a durable, water-tight seal compatible with potable and hydronic water systems
• 250 psi CWP rating handles standard residential and commercial distribution pressure ranges
• Forged DZR brass construction resists dezincification in aggressive water conditions
• 1-1/4 inch nominal size fits main supply and larger branch distribution lines

Compatibility

Designed as an OEM-style transition fitting for 1-1/4 inch press-fit copper piping systems connecting to 1-1/4 inch PEX tubing in residential and light commercial plumbing or hydronic heating installations.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and ASTM standards for press and PEX connections. Shut off and depressurize the water supply and allow the system to drain before cutting into any existing line. The press end requires a compatible press tool with the correct jaw size for the fitting diameter. Do not use an open flame or heat on this fitting during installation.

Technical Specifications

• Nominal Size: 1-1/4 inches
• End Style: Press x PEX
• Pressure Rating: 250 psi CWP
• Seal Material: EPDM O-Ring
• Body Material: Forged DZR Brass

Standard Information

• Brand: NIBCO
• Manufacturer Part Number: H-36805W