Parker 66C-3-2 Compression Tube Connector Brass 1/8-27

Product Description

The PARKER 66C-3-2 is a brass compression tube connector designed to join compression-end tubing to a female NPT port in fluid and gas handling systems. Rated to 400 psi maximum working pressure and suitable for temperatures from -65 degrees F to 250 degrees F, this fitting handles demanding service conditions in HVAC, refrigeration, pneumatic, and hydraulic plumbing lines. The 1/8-27 NPTF thread conforms to SAE J-512, ensuring dimensional compliance and reliable sealing. Licensed plumbers, HVAC technicians, and industrial pipefitters typically install this type of connector when transitioning between compression tubing and threaded female pipe ports.

This connector is suited for residential and light commercial HVAC systems, refrigeration equipment, pneumatic control lines, and instrumentation plumbing where a compression-to-FNPT transition is required. It is commonly installed on copper or aluminum tubing runs that terminate at valves, gauges, or manifold blocks with 1/8-27 female NPT ports. The brass construction resists corrosion in both wet and dry service environments, making it appropriate for fuel gas, refrigerant, water, and compressed air applications within its rated temperature and pressure limits.

Key Features

• Compression x FNPT end connections for tubing-to-threaded-port transitions
• 1/8-27 NPTF thread size for leak-resistant sealing at the female port
• 400 psi maximum working pressure for reliable performance in pressurized systems
• Operating temperature range of -65 degrees F to 250 degrees F
• Brass construction for corrosion resistance across common fluid and gas media
• Conforms to SAE J-512 dimensional standards

Compatibility

Designed as an OEM-style replacement or service fitting for systems requiring a compression-to-FNPT connector with a 1/8-27 NPTF thread, conforming to SAE J-512 specifications.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter. Depressurize and isolate the system completely before removing or installing any compression fitting. Hand-tighten the compression nut onto the tubing ferrule, then advance with a wrench per standard compression fitting practice — avoid over-tightening, which can deform the ferrule and cause leaks. Apply appropriate thread sealant or PTFE tape to the NPTF male threads on the mating port where required by the application and local codes.