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The UPONOR LF4705050 is a lead-free brass tee fitting designed for use with ProPEX expansion-style PEX tubing systems. This 1/2-inch tee creates a three-way branch connection in potable water distribution and hydronic piping installations. The ProPEX connection style requires an expansion tool to enlarge the PEX tubing end and PEX ring before the fitting is inserted, forming a secure, leak-resistant joint as the tubing contracts back to size. Licensed plumbers and mechanical contractors install this fitting in residential and light commercial water supply systems where reliable branch connections are required.
This fitting is suited for 1/2-inch ProPEX plumbing installations, including domestic hot and cold water distribution, radiant heating supply and return branch lines, and manifold branch connections. The lead-free brass construction meets requirements for potable water contact applications. It is typically installed in new construction and retrofit projects where ProPEX tooling and compatible PEX tubing are already in use.
Designed as an OEM-style replacement and new-installation fitting for 1/2-inch ProPEX PEX tubing systems in residential and light commercial plumbing and hydronic applications.
Installation requires a ProPEX expansion tool and appropriately sized PEX rings; shut off and depressurize the water supply before beginning any work. This fitting is installed by licensed plumbers following applicable local plumbing codes and ASTM F1960 expansion fitting standards. Inspect the tubing end for squareness and ensure the PEX ring is fully seated before expanding. Do not use this fitting with crimp or clamp connection systems.
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