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The UPONOR LF4515050 is a 1/2 inch lead-free brass adapter designed to transition between PEX tubing and copper pipe using a press-style connection. It serves as a critical fitting in potable water and hydronic systems where PEX runs must connect to existing copper infrastructure. The lead-free brass construction meets current drinking water standards, making it appropriate for use in residential and light commercial plumbing applications. Licensed plumbers and pipefitters install this fitting as part of new construction or retrofit work where mixed-material piping is required.
This adapter is suited for residential and light commercial plumbing systems where PEX supply lines meet copper distribution piping. Typical installations include under-sink connections, manifold branch runs transitioning to copper mains, and renovation work where existing copper lines are extended using PEX. The press-style connection on the copper side eliminates the need for open flame during installation, making it a practical choice in occupied buildings or fire-restricted areas.
Designed as an OEM-style fitting for 1/2 inch PEX-to-copper press transition applications in residential and light commercial potable water and hydronic plumbing systems.
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 line before cutting or fitting any connections. The copper press end requires a compatible press tool and jaw set rated for the fitting size. Verify that PEX tubing is properly supported and that expansion or crimp rings match the PEX connection type specified for this fitting.
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