1/2" Compression Fitting Assembly

The Uponor A4020500 Fitting Assembly is a precision-engineered component designed for use in PEX piping systems requiring secure compression connections. Manufactured to QS-Style specifications, this fitting ensures reliable sealing performance and mechanical integrity under standard hydronic and potable water system conditions. Constructed for 1/2-inch nominal size tubing, it provides a durable and efficient connection solution for professional installations.

Details

• Model Number: A4020500
• Manufacturer: Uponor
• Product Type: Fitting Assembly
• Series: QS-Style
• Manufacturer Part Number (MPN): 19771
• Connection Type: Compression
• Size: R20 x 1/2 inch nominal
• Hex Size: 1.37 inch
• Pressure Rating: 125 PSI
• Temperature Rating: 220°F (104°C)
• Application: PEX-to-system transition fitting for hydronic or potable water distribution
• Function: Provides a secure mechanical connection between R20 thread and 1/2-inch PEX tubing

Technical Specifications

• Material: Brass body with precision-machined compression interface
• Seal Type: Elastomeric O-ring for positive sealing under system pressure
• Connection Standard: R20 thread to 1/2-inch PEX compression
• Operating Pressure: Rated to 125 PSI under continuous service
• Operating Temperature: Maximum 220°F (104°C)
• Torque Specification: Install to manufacturer’s recommended compression torque for R20 fittings
• System Compatibility: Suitable for Uponor PEX and equivalent ASTM F876/F877-compliant tubing
• Installation: Requires standard compression tool and fittings per Uponor installation guidelines
• Compliance: Meets ASTM, CSA, and NSF standards for hydronic and potable water systems

Summary

The Uponor A4020500 QS-Style Fitting Assembly (MPN 19771) is a 1/2-inch R20 compression connection rated for 125 PSI and 220°F. Engineered for use with PEX systems, it provides a dependable, code-compliant transition fitting for professional hydronic and plumbing installations.