Parker A4TMC2 Push-to-connect Tube Stem Adapter

Product Description

The PARKER A4TMC2 is a push-to-connect tube stem adapter designed to transition between a 1/4 inch OD tube and a 1/8 inch NPTF threaded port. Constructed from POM (polyoxymethylene), the fitting delivers a rated working pressure of 300 psi. The push-to-connect mechanism allows fast, tool-free tube insertion while the threaded end seals directly into a female NPTF port. These fittings are commonly installed by HVAC technicians, plumbers, and industrial service professionals in pneumatic control lines, instrument tubing runs, and fluid-handling assemblies where a reliable tube-to-thread transition is required.

The A4TMC2 is suited for residential and light commercial applications involving pneumatic controls, refrigeration sensing lines, or low-pressure fluid circuits. The 1/8 inch NPTF thread provides a pressure-tight dry seal without the need for additional sealant tape in many installations, though shop practice and system requirements should guide that decision. The 1/4 inch OD tube size is a common dimension in HVAC control tubing and instrumentation lines.

Key Features

• Push-to-connect design allows fast, tool-free tube insertion and secure retention
• POM (polyoxymethylene) construction resists moisture and common refrigeration system chemicals
• 300 psi rated working pressure suitable for pneumatic and low-pressure fluid applications
• 1/8 inch NPTF thread provides a dry-seal pressure-tight connection
• Tan color for quick visual identification in multi-fitting assemblies
• Compact form factor fits into tight equipment cabinets and control panels

Compatibility

Designed as an OEM-style push-to-connect tube stem adapter for systems using 1/4 inch OD tubing and 1/8 inch NPTF threaded ports in pneumatic, HVAC control, and low-pressure fluid-handling applications.

Installation Notes

Depressurize and isolate the system completely before removing or installing any tube fittings. Verify the tube end is cut square and free of burrs before inserting into the push-to-connect collet. Thread the NPTF end into the receiving port by hand first to confirm thread engagement, then tighten with an appropriate wrench to avoid over-torquing the POM body. Follow applicable plumbing and pneumatic system codes for pressure testing after installation.