Parker 66CA-8-4 Compression Tube Connector Brass Fnpt

Product Description

The PARKER 66CA-8-4 is a brass compression tube connector designed to join a compression tube end to a female NPT port. It provides a reliable, leak-resistant mechanical connection in fluid and gas line applications where a compression fitting mates directly to a threaded FNPT port. Built from brass, this connector handles a maximum working pressure of 750 psi and a temperature range of -65 degrees F to 250 degrees F. It is commonly installed by HVAC technicians, plumbers, and industrial pipefitters working on refrigerant, pneumatic, hydraulic, or fluid transfer systems that require a secure tube-to-pipe transition.

This connector is suited for residential and commercial applications involving copper, brass, or compatible soft tubing running into threaded pipe ports. Typical install scenarios include control line connections, instrument tubing, refrigerant accessory lines, and pneumatic control circuits. The 1/4-18 NPTF thread standard ensures a dry-seal mechanical fit, reducing reliance on thread sealant compounds. It is sold and packaged individually, making it a practical replacement or maintenance item for field service kits.

Key Features

• Brass construction for corrosion resistance in fluid and gas service
• Compression x FNPT end connections for tube-to-pipe transitions
• 1/4-18 NPTF thread standard provides a dry-seal mechanical fit
• Rated to 750 psi maximum working pressure
• Wide temperature range: -65 degrees F to 250 degrees F
• Sold individually — no minimum multi-pack required

Compatibility

Designed as an OEM-style replacement compression tube connector for systems requiring a 1/4-18 NPTF female threaded port connection with a compression tube inlet.

Installation Notes

Installation should be performed by a licensed HVAC technician, plumber, or qualified pipefitter. Before servicing, isolate and depressurize the line and verify the system is de-energized where applicable. Hand-tighten the compression nut onto the tube, then use an appropriate open-end wrench to snug the fitting — do not overtighten, as this can deform the compression ferrule and cause leaks. Verify the NPTF thread engagement and inspect for leaks after restoring line pressure.