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The UPONOR LF4511010 is a 1-inch lead-free brass adapter designed to transition between PEX tubing and copper pipe in residential and commercial plumbing systems. The fitting connects PEX on one end and a sweat copper connection on the other, making it a practical transition fitting for potable water distribution lines. Manufactured from lead-free brass to meet safe drinking water standards, this adapter is intended for installation by licensed plumbers working on hot and cold water supply systems where PEX and copper materials meet.
This adapter is commonly used in new construction and retrofit plumbing projects where a PEX distribution system ties into existing copper supply lines or copper manifolds. It is well suited for residential water supply rough-in and remodel work where mixed-material transitions are required. The domestic designation indicates the fitting is manufactured to comply with U.S. potable water requirements.
Designed as an OEM-style transition fitting for 1-inch PEX tubing to 1-inch copper pipe connections in potable water 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 beginning work. The copper sweat end requires standard soldering tools and flux-core solder rated for potable water use. Verify PEX end connection method compatibility with your specific PEX system before installation.
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