Parker 398P-4-2 Compression Shutoff Pipe Fitting Brass

Product Description

The PARKER 398P-4-2 is a brass compression tube single end shutoff pipe fitting designed for tube-to-pipe connections in fluid and pneumatic systems. It features a 1/8-27 NPTF threaded pipe end and a compression-style tube connection on the opposing end. Constructed from brass, this fitting handles working pressures up to 150 psi and operates across a temperature range of 0 degrees F to 150 degrees F. It measures 2.45 inches in overall length. This type of fitting is commonly installed by HVAC technicians, plumbers, and pipefitters wherever a single-end shutoff and a reliable tube-to-pipe transition are required in a compact form factor.

The 398P-4-2 is suited for residential and light commercial applications involving compressed air, water, and compatible fluid lines. It is typically found in instrument tubing runs, refrigeration lines, and plumbing control circuits where a shutoff function is needed at a pipe thread port. The NPTF thread standard ensures a pressure-tight seal without relying solely on thread sealant, making it appropriate for demanding service environments.

Key Features

• Brass construction for corrosion resistance in fluid and air service
• 1/8-27 NPTF thread provides a pressure-tight pipe connection
• Compression tube end allows tool-assisted, leak-resistant tube attachment
• Rated to 150 psi maximum working pressure
• Operating temperature range of 0 degrees F to 150 degrees F
• Compact 2.45-inch overall length suits tight installation spaces

Compatibility

Designed as an OEM-style replacement or new-installation compression tube shutoff fitting for systems requiring a 1/8-27 NPTF pipe thread connection with a compression tube outlet.

Installation Notes

This fitting is installed by licensed plumbers, HVAC technicians, or pipefitters working on fluid or pneumatic lines. Shut off system pressure and depressurize the line completely before removing or installing any compression fitting. Apply thread sealant or PTFE tape to the NPTF pipe threads as required by the applicable plumbing or mechanical code. Tighten the compression nut to snug-plus-firm by hand and wrench only — do not overtighten, as brass fittings are susceptible to thread and ferrule damage from excessive torque.