Uponor Q4771313 Propex Coupling 1-1/4 Inch

Product Description

The UPONOR Q4771313 is a ProPEX-style coupling fitting designed to join PEX tubing in potable water, hydronic, and plumbing distribution systems. Constructed from modified polyphenylsulfone (MPPSU), this coupling offers strong resistance to high temperatures and aggressive water conditions. It is sized for 1-1/4 inch nominal tubing and uses the ProPEX expansion end style, which requires a compatible PEX expansion tool to swage the fitting ring before insertion. Licensed plumbers and hydronic system installers are the primary tradespeople who work with this fitting in both new construction and retrofit applications.

This coupling is suited for residential and light commercial plumbing and radiant heating installations where PEX tubing must be joined or extended. The ProPEX end style creates a mechanically secure, leak-resistant connection as the expanded ring contracts around the fitting body. It is domestically manufactured, making it a common specification choice on projects that require domestic-origin materials compliance.

Key Features

• 1-1/4 inch nominal size for standard PEX tubing connections
• ProPEX expansion end style for a reliable, tool-driven mechanical connection
• Modified polyphenylsulfone construction for high-temperature and chemical resistance
• Domestically manufactured for projects requiring domestic-origin compliance
• Straight coupling configuration for in-line tubing joins or repairs

Compatibility

Designed as an OEM-style ProPEX fitting for use with 1-1/4 inch PEX tubing systems requiring an expansion-style coupling connection.

Installation Notes

Installation requires a calibrated ProPEX expansion tool sized for 1-1/4 inch fittings. Shut off and depressurize the water supply before cutting into any existing line. Follow applicable plumbing codes, including IPC and local amendments, for fitting selection and pressure ratings. Allow the expanded PEX ring to fully contract onto the fitting body before pressurizing the system.

Technical Specifications

• Nominal Size: 1-1/4 inches
• End Style: ProPEX Expansion
• Material: Modified Polyphenylsulfone (MPPSU)
• Origin: Domestic

Standard Information

• Brand: UPONOR
• Manufacturer Part Number: Q4771313