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The NIBCO px01676x is a female sweat adapter fitting designed for transitioning between PEX tubing and copper or sweat-connect fittings in residential and light commercial plumbing systems. Conforming to the ASTM F1807 standard, this adapter connects a 1/2 inch PEX side to a 3/4 inch female sweat (solder) connection, making it a practical solution for integrating PEX distribution lines into existing copper infrastructure. Licensed plumbers and pipefitters install this fitting where PEX-to-copper transitions are required at manifolds, valves, or fixture supply connections.
This fitting is suited for potable water distribution systems in residential new construction and retrofit applications. It is commonly installed where a PEX branch line must connect to a copper stub-out, a sweat-connect valve, or a fixture supply fitting. The F1807 designation indicates a metal insert-style PEX fitting, crimped onto the PEX tubing using a standard crimp ring and calibrated crimp tool. The 1/2 inch by 3/4 inch sizing accommodates common branch-to-main or PEX-to-valve transition scenarios.
Designed as an OEM-style transition fitting for F1807-compliant PEX crimp systems connecting to 3/4 inch female sweat copper fittings and valves in potable water plumbing installations.
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 PEX side requires a correctly sized crimp ring and a calibrated PEX crimp tool; the sweat end requires standard soldering equipment and lead-free solder compliant with applicable codes. Do not overtighten or deform the fitting during assembly.
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