Parker A5UC4-MG Push-to-connect Union Tube Fitting

Product Description

The PARKER A5UC4-MG is a push-to-connect union tube fitting designed to join two tubes in a straight, inline connection without tools or thread preparation. Constructed from polyoxymethylene (POM), a rigid engineering-grade thermoplastic, this fitting handles working pressures up to 300 psi. It accepts a 5/16 inch OD tube on one end and a 1/4 inch OD tube on the other, making it a reducing union suitable for systems that step down tubing size. Plumbers, HVAC technicians, and fluid-system installers commonly use POM push-to-connect fittings in pneumatic, water, and light hydraulic line applications.

This fitting is suited for residential and light commercial installations where a quick, reliable tube-to-tube connection is needed between two different OD tubing sizes. Typical applications include instrument air lines, water purification plumbing, pneumatic control tubing, and condensate or fluid distribution systems. The push-to-connect design allows fast field assembly and straightforward tube removal when a release collar is depressed, reducing labor time on tight or repetitive installations.

Key Features

• Push-to-connect design — no tools, solvents, or compression sleeves required for assembly
• Reducing union configuration accepts 5/16 inch OD on one port and 1/4 inch OD on the other
• Rated to 300 psi working pressure
• Polyoxymethylene (POM) body offers high rigidity, low moisture absorption, and chemical resistance for fluid-line service
• Tan color for quick visual identification in multi-line installations
• Compact, lightweight construction at 0.02 pounds

Compatibility

Designed as an OEM-style push-to-connect replacement or new-install fitting for pneumatic, water, and fluid distribution systems using 5/16 inch and 1/4 inch OD tubing.

Installation Notes

Depressurize and drain the line completely before removing or installing any push-to-connect fitting. Ensure tube ends are cut square with no burrs or scratches in the insertion zone, as surface defects compromise the internal seal. Verify that tubing OD dimensions match the fitting ports exactly before insertion. This fitting is intended for use within its rated pressure limit — do not exceed 300 psi in service.