Parker 66C-5-2 Compression Tube Connector 1/8-27 Fnpt

Product Description

The PARKER 66C-5-2 is a brass compression tube connector designed to join compression tubing to female NPT threaded ports in fluid and pneumatic systems. It features a compression inlet on one end and a 1/8-27 FNPT threaded connection on the other, providing a reliable, leak-resistant joint without the need for solder or special tooling. Manufactured from brass to resist corrosion, the fitting is rated for working pressures up to 300 psi and a temperature range of -65 degrees F to 250 degrees F. It meets SAE J-512 standards and is sized at 1.07 inches overall length. Plumbers, HVAC technicians, and industrial piping contractors install this fitting in low-pressure fluid and gas line assemblies.

This fitting is suited for residential and light commercial applications where compression tubing must terminate at a female NPT port. Typical installations include refrigeration lines, pneumatic control circuits, instrument air lines, and plumbing distribution systems. The 1/8-27 thread size is common in control and sensing connections, making this connector a standard choice when transitioning from compression tube to NPT-threaded equipment, valves, or gauges.

Key Features

• Compression x FNPT end connections allow tubing to thread directly into NPT-ported equipment
• Brass construction provides corrosion resistance in fluid and low-pressure gas service
• Rated to 300 psi maximum working pressure
• Operating temperature range of -65 degrees F to 250 degrees F
• Meets SAE J-512 standard for compression fittings
• Compact 1.07-inch overall length for tight installation spaces

Compatibility

Designed as an OEM-style compression tube connector for systems using 1/8-27 FNPT threaded ports and compatible compression tubing per SAE J-512.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified piping mechanic. Shut off and depressurize the line before disassembly or fitting installation. Hand-tighten the compression nut first, then advance with a wrench per standard compression fitting practice — do not overtighten, as brass fittings are susceptible to thread damage. Verify all connections are leak-free under pressure before returning the system to service.