Uponor Q4777575 Propex Coupling 3/4 Inch Polysulfone

Product Description

The UPONOR Q4777575 is a 3/4-inch nominal ProPEX coupling manufactured from polysulfone, a high-performance thermoplastic rated for demanding plumbing and hydronic applications. This fitting connects two sections of PEX tubing using the ProPEX expansion method, which requires an expansion tool to flare the tubing end before seating the fitting. The polysulfone construction resists heat, pressure, and chemical degradation, making it well suited for both hot and cold water distribution systems. Licensed plumbers and mechanical contractors install this coupling as part of new construction or repair work on ProPEX-compatible piping systems.

This coupling is intended for use in residential and light commercial plumbing systems where ProPEX-style expansion fittings are specified. It is a straight coupling designed to join two runs of 3/4-inch PEX tubing in-line. Typical applications include potable water supply lines, radiant heating distribution manifold branches, and hydronic piping where a reliable, leak-resistant connection is required. Installation is performed using the ProPEX expansion method in accordance with applicable plumbing codes.

Key Features

• 3/4-inch nominal size fits standard 3/4-inch PEX tubing
• ProPEX end style uses the expansion method for a secure, compression-free connection
• Polysulfone material provides resistance to heat, pressure, and common water treatment chemicals
• Domestic manufacturing origin as indicated by product designation
• Straight coupling configuration joins two in-line tubing runs without directional change

Compatibility

Designed as an OEM-style ProPEX expansion fitting compatible with 3/4-inch PEX tubing systems using the ProPEX expansion connection method.

Installation Notes

Installation requires a calibrated ProPEX expansion tool sized for 3/4-inch tubing. Shut off the water supply and depressurize the system before cutting or modifying any existing piping. Allow expanded tubing ends to fully contract onto the fitting before pressurizing the system. Work must comply with local plumbing codes and applicable IPC or IRC requirements governing PEX piping installations.

Technical Specifications

• Nominal Size: 3/4 inches
• End Style: ProPEX Expansion
• Material: Polysulfone
• Origin: Domestic

Standard Information

• Brand: UPONOR
• Manufacturer Part Number: Q4777575