Parker 68C-4-4 Compression Tube Connector Brass

Product Description

The PARKER 68C-4-4 is a brass compression tube connector designed to join 1/4-inch OD tubing to a male NPT threaded port. It provides a secure, leak-resistant mechanical connection without soldering or brazing. The fitting uses a compression-style end on one side and a 1/4-18 MNPT threaded end on the other, making it suitable for mixed-connection plumbing and instrumentation assemblies. Rated to 300 psi maximum working pressure and capable of handling temperatures from -65 degrees F to 250 degrees F, this connector is built to NPTF thread standards and meets SAE J-512 specifications. Installers in HVAC, refrigeration, and plumbing trades use this type of fitting where a reliable tube-to-pipe transition is required.

This connector is used in residential and light commercial applications where 1/4-inch OD tubing must terminate at a threaded port on a valve, manifold, gauge, or instrument. Typical install scenarios include refrigeration lines, pneumatic controls, fuel lines, and hydraulic instrument tubing. The brass construction resists corrosion in a wide range of media. Its compact body fits in tight panel or cabinet installations where space is limited.

Key Features

• Compression x MNPT end connections for tube-to-threaded-pipe transitions without soldering
• Brass construction for corrosion resistance across a broad range of fluid and gas media
• 300 psi maximum working pressure rating
• Operating temperature range of -65 degrees F to 250 degrees F
• 1/4-18 NPTF thread standard for pressure-tight engagement
• Meets SAE J-512 standards for automotive and industrial tube fittings

Compatibility

Designed as an OEM-style compression tube connector for systems using 1/4-inch OD tubing with 1/4-18 MNPT threaded ports, consistent with SAE J-512 and NPTF thread standards.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter familiar with compression fitting assembly. Shut off system pressure and depressurize the line completely before disassembly or installation. Do not overtighten the compression nut, as excessive force can deform the ferrule and compromise the seal. Follow applicable IPC and IFGC guidelines for the specific fluid or gas service.