Parker 68CA-6-4 Compression Tube Connector Brass

Product Description

The PARKER 68CA-6-4 is a brass compression tube connector designed to create a leak-tight joint between a 3/8 inch outside diameter tube and a male National Pipe Taper Fitting (MNPT) port. One end accepts a compression tube fitting; the other end threads into a standard NPTF male port using a 1/4-18 thread. Rated to 1000 psi maximum working pressure and capable of handling temperatures from -65 degrees F to 250 degrees F, this connector is suited for hydraulic, pneumatic, refrigeration, and fluid-transfer lines where a reliable, vibration-resistant connection is required. Plumbers, HVAC technicians, and industrial piping contractors are the typical installers.

This fitting is used in residential and light commercial applications wherever a compression-to-MNPT transition is needed. Common install scenarios include instrument tubing connections, control-line plumbing, hydraulic equipment, and HVAC refrigerant or oil-line assemblies that terminate at a threaded male port. The brass construction makes it compatible with water, air, oil, and many common refrigerants at moderate pressures. It ships as a single piece, making it easy to order exact quantities for service calls or small-scale jobs.

Key Features

• Compression x MNPT end connections — no soldering or flaring required on the tube side
• 1/4-18 NPTF thread standard for a pressure-tight threaded seal
• 3/8 inch tube outside diameter compression connection
• 1000 psi maximum working pressure for demanding fluid and pneumatic service
• Operating temperature range of -65 degrees F to 250 degrees F
• Brass construction for corrosion resistance in water, air, and oil service

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems that require a 3/8 inch OD tube compression connection transitioning to a 1/4-18 NPTF male threaded port.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or qualified industrial pipefitters. Depressurize and isolate the line completely before disassembling any existing fittings. Hand-tighten the NPTF thread first, then use a wrench for final make-up — avoid overtightening, which can crack brass fittings or distort the compression ferrule. Follow applicable codes such as ASME B31.1 or local mechanical codes for pressure-rated tubing assemblies.