3/4 inch x 3/4 inch x 1/2 inch PEX Engineered Plastic Reducing Insert Tee PEX x PEX x PEX

Uponor Q4757550 PEX Reducing Tee – Engineered for Secure PEX Transitions

The Uponor Q4757550 PEX Reducing Tee provides a dependable solution for branching and reducing pipe sizes in PEX plumbing systems. Manufactured from high-performance polymer (PPSU), this tee is corrosion-resistant and approved for use in potable water distribution, hydronic heating, and cooling applications.

Product Features

• ✅ Material: Constructed from durable engineered polymer (PPSU) for resistance to corrosion and mineral buildup.
• ✅ Connection Type: ASTM F1960 cold expansion PEX connection (ProPEX®), compatible with Uponor PEX-a tubing.
• ✅ Transition Capability: 3/4 inch PEX x 3/4 inch PEX x 1/2 inch PEX – ideal for reducing to smaller branch lines while maintaining system integrity.
• ✅ Code Compliance: Meets or exceeds ASTM F877 and NSF/ANSI 14 and 61 standards for potable water systems.
• ✅ High-Temperature Rated: Suitable for continuous operation in hot water systems (up to 200°F at 80 psi).

Application and Installation

This tee is specifically designed for use with ProPEX® expansion connections, requiring an expansion tool and PEX-a tubing. Its push-and-expand connection method ensures a tight, reliable seal with no O-rings, glues, or soldering needed. This results in fewer failure points and long-term performance across a variety of applications including:

• Potable water distribution systems
• Radiant heating and cooling loops
• Hydronic baseboard heating

Installation Notes

Proper use of the ProPEX® expansion system is critical to the performance of the fitting. Ensure clean, square pipe cuts and use of approved expansion rings. No clamping or crimping tools are used with this fitting type.

Standards and Certifications

• UPC and NSF certified
• ASTM F1960 and F877 compliant
• Lead-free in accordance with the Safe Drinking Water Act

Did You Know?

Uponor’s engineered polymer fittings are dimensionally stable, maintaining strength and performance under repeated thermal cycling, a key factor in long-term plumbing and hydronic reliability.

With its robust design and compatibility with industry-standard expansion PEX systems, the Q4757550 reducing tee ensures efficient installations with long-lasting, code-compliant performance. Ideal for demanding professional applications.