Parker A5TMC4 Tube Stem Adapter 5/16 Od 1/4 Nptf 300 Psi

Product Description

The PARKER A5TMC4 is a push-to-connect tube stem adapter designed to create a secure, leak-resistant connection between tubing and threaded ports in fluid and pneumatic systems. Machined from acetal (polyoxymethylene), this fitting accepts 5/16-inch OD tubing and threads into a 1/4-inch NPTF port. It is rated to 300 psi maximum working pressure and handles temperatures from -20 degrees F to 180 degrees F. The push-to-connect design allows tubing to seat without additional tools, making it a practical choice for plumbing technicians and HVAC service professionals working in tight or hard-to-reach spaces.

This adapter is suited for residential and light commercial fluid distribution and pneumatic control applications. Typical installations include condensate drain lines, low-pressure air lines, and control system tubing runs where a threaded port must transition to push-connect tubing. The NPTF thread form provides a pressure-tight mechanical seal without relying solely on thread sealant. The tan acetal construction resists corrosion and many common system fluids encountered in HVAC and plumbing service work.

Key Features

• Push-to-connect design accepts 5/16-inch OD tubing without tools
• 1/4-inch NPTF male thread for pressure-tight port connections
• 300 psi maximum working pressure rating
• Operating temperature range: -20 degrees F to 180 degrees F
• Acetal (polyoxymethylene) construction resists corrosion and common system fluids
• Tan color for easy visual identification in multi-line installations

Compatibility

Designed as an OEM-style push-to-connect adapter compatible with 5/16-inch OD tubing and 1/4-inch NPTF threaded ports in low-pressure fluid and pneumatic systems.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or qualified mechanics working on fluid or pneumatic systems. De-pressurize and isolate the system before removing or installing any fittings. Ensure tubing is cut cleanly and squarely, with no burrs, before inserting into the push-connect fitting to achieve a proper seal. NPTF threads are self-sealing by design, but consult applicable system codes and manufacturer guidance regarding the use of thread sealant compounds.