Parker A5RD8-MG Push-to-connect Plug-in Reducer 5/16 in

Product Description

The PARKER A5RD8-MG is a push-to-connect plug-in reducer tube fitting designed for quick, tool-free connections in pneumatic and fluid transfer lines. Molded from polyoxymethylene (POM), a rigid engineering thermoplastic, this fitting delivers a rated working pressure of 300 psi while resisting moisture, fuels, and many common solvents. It accepts tubing with a 5/16 inch outside diameter and reduces to a smaller line without requiring ferrules, threads, or clamps. HVAC technicians, plumbers, and industrial maintenance techs use this fitting wherever a fast, reliable tube reduction is needed in a low-bulk installation.

This fitting suits residential and light commercial pneumatic control lines, compressed air distribution, fluid handling systems, and similar low-to-medium pressure applications where POM construction is compatible with the media. The plug-in design allows a technician to seat the tube with a single straight push, locking it in place for a leak-resistant connection. It is suited for installations where space is tight and quick serviceability is a priority.

Key Features

• Push-to-connect design — no tools, ferrules, or threads required for tube insertion
• Rated to 300 psi working pressure
• Polyoxymethylene (POM) body offers high rigidity, dimensional stability, and chemical resistance
• Accepts 5/16 inch OD tubing — plug-in reducer configuration for line size transitions
• Tan color for visual identification in multi-line installations
• Compact, lightweight at 0.02 pounds — minimal impact on tubing layout

Compatibility

Designed as an OEM-style push-to-connect reducer fitting for pneumatic control and fluid transfer tubing systems using 5/16 inch OD tubing. Confirm media and temperature compatibility with POM before installation.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or qualified maintenance personnel. Before servicing any line, depressurize the system completely and verify pressure has bled to zero. To install, cut tubing square with a clean tube cutter, insert the tube fully into the fitting until it seats and locks. To release, depress the collet ring while pulling the tube straight out — never pull at an angle, as this can deform the collet and cause a leak path.