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The UPONOR q4755050 is an all-plastic cold expansion tee fitting designed for use with 1/2 inch F1960 PEX piping systems. This tee connects three sections of PEX tubing at a branch point and is installed using the cold expansion method, where the fitting end and tubing are expanded before the fitting is inserted and allowed to contract for a secure, leak-resistant joint. Weighing only 0.03 pounds, this lightweight plastic fitting is well suited for residential and light commercial plumbing and hydronic distribution systems. Licensed plumbers and PEX-certified installers are the primary trade for this type of fitting.
This fitting is used in F1960 cold expansion PEX installations, including potable water distribution, radiant heating supply and return branches, and other closed-loop hydronic applications. The all-plastic construction makes it appropriate for systems where metal fittings are not preferred, such as low-corrosion or dezincification-sensitive environments. It is sized for 1/2 inch PEX tubing and follows ASTM F1960 dimensional standards, making it compatible with other F1960-compliant components in the same installation.
Designed as an OEM-style F1960 cold expansion fitting for use with 1/2 inch PEX tubing systems installed per ASTM F1960 standards.
Installation requires a calibrated cold expansion tool and compatible F1960 PEX expansion rings sized for 1/2 inch tubing. Shut off the water supply and depressurize the line before cutting into an existing system. Allow the expanded fitting joint to recover fully before pressurizing the system, following the time requirements specified by ASTM F1960. Work should comply with applicable local plumbing codes and IPC guidelines.
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