Parker 66AB-6-6 Compression Tube Connector 3/8-18 Nptf

Product Description

The PARKER 66AB-6-6 is a brass compression tube connector designed to join a compression-end tube to a female NPT threaded port. Built to handle working pressures up to 400 psi and a temperature range of -65 degrees F to 250 degrees F, this fitting is suited for demanding fluid and pneumatic line applications. Manufactured from brass, it meets D.O.T. FMVSS571.106 and SAE J246 standards, making it appropriate for brake and fuel line systems as well as general hydraulic and pneumatic plumbing. Plumbers, HVAC technicians, and fleet mechanics rely on this type of connector for secure, leak-resistant tube terminations in both mobile and stationary equipment.

This connector is used in residential, commercial, and mobile equipment installations where a compression tube must transition to a female NPT threaded fitting. Typical applications include compressed air lines, hydraulic systems, brake line assemblies, and fuel system plumbing. The 3/8-18 NPTF thread size is a common standard in light-duty to medium-duty fluid power and vehicle service work. Its brass construction resists corrosion in environments exposed to water, air, and many petroleum-based fluids.

Key Features

• Compression x FNPT end connections for tube-to-pipe transitions
• 3/8-18 NPTF thread size for a pressure-tight seal without secondary sealant
• Rated to 400 psi maximum working pressure
• Operating temperature range of -65 degrees F to 250 degrees F
• Brass construction for corrosion resistance and compatibility with common fluids
• Meets D.O.T. FMVSS571.106 and SAE J246 standards

Compatibility

Designed as an OEM-style replacement or service fitting for compression tube-to-female NPT connections in fluid power, pneumatic, and vehicle brake or fuel line systems requiring a 3/8-18 NPTF thread.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or fleet mechanic familiar with compression fittings and NPT threaded connections. Depressurize and isolate the line completely before removing or installing any fitting. NPTF threads are designed to seal on the thread form itself, but confirm system requirements before applying thread sealant. Do not overtighten compression fittings, as excess torque can deform the ferrule and compromise the seal.