Parker A4TMC4 Tube Stem Adapter 1/4 in Od Nptf 300 Psi

Product Description

The PARKER A4TMC4 is a push-to-connect tube stem adapter designed to transition between a push-fit tube connection and a threaded port in fluid and pneumatic systems. It accepts 1/4-inch outside diameter tubing and features a 1/4-inch NPTF thread for a pressure-tight mechanical seal without thread sealant. The body is molded from POM (polyoxymethylene), a rigid acetal resin that resists moisture, fuels, and many hydraulic fluids. Rated to 300 psi, this fitting is a standard component in compressed air lines, instrument tubing runs, and light hydraulic circuits. Plumbers, HVAC technicians, and instrumentation mechanics install this type of adapter where a tube run must terminate at or originate from a threaded manifold, valve body, or panel port.

This adapter is suited for residential and light commercial applications involving 1/4-inch OD tubing in compressed air distribution, refrigeration instrument lines, pneumatic controls, and water treatment or filtration plumbing. The NPTF thread form provides a dry-seal connection, making it appropriate for installations where thread compound use is restricted or where cleanliness is a priority. The push-to-connect end allows fast, tool-free tube insertion and secure retention under system pressure up to 300 psi.

Key Features

• Push-to-connect design accepts 1/4-inch OD tubing without tools or ferrules
• 1/4-inch NPTF dry-seal thread for leak-resistant port connections
• POM (acetal) body resists moisture, common solvents, and mild hydraulic media
• 300 psi pressure rating for compressed air and light fluid service
• Tan color provides quick visual identification in multi-line installations

Compatibility

Designed as an OEM-style push-to-connect adapter for systems using 1/4-inch OD tubing with 1/4-inch NPTF threaded ports. Specific system compatibility was not provided in the product data; verify port thread form and tubing material compatibility before installation.

Installation Notes

De-pressurize and lock out the system before removing or installing any push-to-connect fitting. Ensure tubing ends are cut square and deburred to achieve a proper seal at the collet. NPTF threads are designed for dry-seal engagement, but verify the mating port thread form matches NPTF before assembly. Follow applicable compressed air or plumbing codes, such as ASME B31.1 or local mechanical codes, for pressure piping installations.