Parker 66CA-6-6 Compression Tube Connector Brass 3/8-18

Product Description

The PARKER 66CA-6-6 is a brass compression tube connector designed to create a secure, leak-resistant joint between a compression tube end and a female NPT port. Built for demanding fluid and gas line applications, this fitting features a 3/8-18 NPTF thread on the female pipe side and a compression end sized for 3/8 inch outside diameter tubing. The brass construction provides corrosion resistance and reliable sealing across a wide temperature range, from -65 degrees F to 250 degrees F, with a maximum working pressure of 1000 psi. Licensed plumbers, HVAC technicians, and pipefitters commonly install this type of connector in instrumentation, refrigeration, and hydraulic line assemblies.

This connector fits applications requiring a transition from compression tubing to a female NPT port. It is suited for use in residential and light commercial systems where brass fittings are specified, including plumbing, HVAC refrigerant-side accessory lines, pneumatic controls, and general fluid handling. The NPTF thread standard provides an interference-type seal at the threads, reducing dependence on additional thread sealant. The compression end accommodates 3/8 inch OD tubing without soldering or brazing, making it practical for field installations with limited access.

Key Features

• Compression x FNPT end connections for tool-accessible, no-solder tube termination
• 3/8-18 NPTF thread standard for pressure-tight thread-form sealing
• Rated to 1000 psi maximum working pressure
• Wide service temperature range: -65 degrees F to 250 degrees F
• Brass material offers corrosion resistance for water, air, and compatible fluid service
• Accepts 3/8 inch outside diameter tubing on the compression end

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems specifying 3/8-18 NPTF female pipe thread ports paired with 3/8 inch OD compression tubing connections.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter in accordance with applicable codes including the IPC and IFGC where relevant. Shut off and depressurize the line completely before removing or installing any compression fitting. Inspect the tubing end for squareness and deburr before seating in the compression ferrule to ensure a proper seal. Do not overtighten the compression nut, as this can deform the ferrule and compromise the joint.