Uponor LF4511313 Pex X C Adapter 1-1/4 Inch Brass

Product Description

The UPONOR LF4511313 is a 1-1/4 inch lead-free brass adapter designed to transition between PEX tubing and copper pipe using a PEX x C (sweat) connection. This fitting is manufactured domestically and serves as a critical connection point in potable water distribution systems, radiant heating installations, and hydronic piping applications. The lead-free brass construction meets drinking water compliance requirements, making it suitable for use in systems supplying potable water. Licensed plumbers and mechanical contractors install this type of fitting during new construction and retrofit projects where PEX and copper systems must be joined.

This adapter is used in residential and light commercial plumbing systems where a direct transition from PEX tubing to copper sweat fittings is required. Typical install scenarios include connecting PEX supply lines to copper manifolds, existing copper stub-outs, or copper distribution headers. The 1-1/4 inch size is common in main distribution lines and larger branch runs where flow capacity is a priority.

Key Features

• 1-1/4 inch PEX x C (sweat) connection for direct PEX-to-copper transitions
• Lead-free brass construction meets Safe Drinking Water Act compliance standards for potable water applications
• Domestic manufacture
• Sweat end accepts standard copper fittings and soldering techniques
• Suitable for both potable water and hydronic heating systems

Compatibility

Designed as an OEM-style transition fitting for 1-1/4 inch PEX tubing systems requiring a copper sweat connection interface.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the water supply and depressurize the system before beginning work. The copper sweat end requires standard soldering tools and flux; ensure the copper surface is clean and dry before soldering. The PEX end must be expanded or connected using the appropriate UPONOR expansion tool compatible with the 1-1/4 inch size.

Technical Specifications

• Size: 1-1/4 inches
• Connection Type: PEX x C (Sweat)
• Material: Brass, Lead-Free
• Country of Origin: Domestic

Standard Information

• Brand: UPONOR
• Manufacturer Part Number: LF4511313