Parker 66C-7-6 Compression Tube Connector 3/8-18 Fnpt

Product Description

The PARKER 66C-7-6 is a brass compression tube connector designed to join tubing to female NPT threaded ports in fluid and pneumatic distribution systems. It features a 3/8-18 thread size with a compression-to-FNPT end configuration, allowing a secure, leak-resistant connection without soldering or brazing. Rated to 200 psi maximum working pressure and conforming to SAE J-512, this fitting is suited for applications demanding reliable sealing across a wide temperature range. Licensed plumbers, HVAC technicians, and pipefitters working on refrigeration lines, compressed air systems, and hydraulic circuits commonly install this type of connector.

This fitting is appropriate for residential and light commercial systems where tubing must connect to a female NPT threaded port. Typical install scenarios include compressed air distribution, fuel lines, hydraulic circuits, and HVAC refrigerant or oil line connections. The compression end accommodates standard tubing, eliminating the need for flared ends or solder joints. Its brass construction provides corrosion resistance in most industrial fluid service environments.

Key Features

• Compression x FNPT end connections for tool-friendly, no-solder tube-to-port installation
• Brass construction provides corrosion resistance in air, water, oil, and many fuel service applications
• 200 psi maximum working pressure rated per SAE J-512
• Wide service temperature range: -65 degrees F to 250 degrees F
• 3/8-18 NPTF thread standard ensures pressure-tight engagement with mating female ports
• Sold individually, one piece per package

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems requiring a 3/8-18 NPTF compression-to-FNPT brass connector conforming to SAE J-512.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified HVAC technician following applicable local codes and IFGC or IPC guidelines where relevant. Depressurize and isolate the system completely before removing or installing any fitting. Use appropriate thread sealant or PTFE tape on the NPT threads as required by the application; do not over-tighten the compression nut, as brass fittings are susceptible to thread and ferrule damage from excessive torque. Verify tubing is cut square, deburred, and fully seated before tightening the compression end.