Parker 171PTC-8-4 Push-to-connect Tube Mnpt Fitting

Product Description

The PARKER 171PTC-8-4 is a brass push-to-connect tube-to-male NPT tube fitting designed for pneumatic and fluid line connections in commercial and industrial applications. It features a 1/2 inch outside diameter tube connection on each end and a 1/4 inch NPTF male thread in the center, allowing a tube-in, tube-out configuration with a threaded port for manifold or component mounting. Rated to 250 psi maximum working pressure, the fitting is built from brass with a nitrile O-ring seal for reliable, leak-resistant performance across a wide temperature range. It carries a D.O.T. air brake fitting designation, making it suitable for regulated air brake system installations.

This fitting is used in air brake lines, pneumatic control systems, and compressed air distribution where a push-to-connect interface is needed alongside an NPT threaded port. The D.O.T. air brake rating makes it a common choice for commercial vehicle service, fleet maintenance, and heavy equipment pneumatic plumbing. It installs quickly without flare tools or compression sleeves, which reduces labor time on multi-line assemblies. The fitting suits both new builds and repair work where fast, secure tube connections are required in tight spaces.

Key Features

• Push-to-connect ends accept 1/2 inch OD tube without additional tooling
• 1/4 inch NPTF male center thread for direct port or manifold connection
• 250 psi maximum working pressure rating
• D.O.T. air brake fitting designation for regulated vehicle air brake systems
• Brass body with nitrile O-ring for corrosion resistance and reliable sealing
• Operating temperature range of -40 degrees F to 200 degrees F

Compatibility

Designed for use with 1/2 inch OD tubing in pneumatic and air brake systems requiring a tube-to-male NPT push-to-connect configuration. D.O.T. air brake fitting designation applies where that certification is required by system specifications.

Installation Notes

Installation is typically performed by licensed mechanics, fleet technicians, or plumbing and pneumatic system professionals. Depressurize and isolate the air line completely before removing or installing any fitting. Ensure tube ends are cut cleanly and squarely with a tube cutter and are free of burrs before insertion into the push-to-connect ports. Verify thread sealant compatibility with the system media before applying to the NPTF male thread, and torque to the port manufacturer specification.