Parker 66NBH-8-6 Compression Bulkhead Union 3/8 Inch Brass

Product Description

The PARKER 66NBH-8-6 is a brass compression tube bulkhead union designed to pass tubing through a panel, bulkhead, or wall and create a secure, leak-resistant connection on both sides. It uses compression-style end connections on each end, eliminating the need for soldering or flaring. The fitting carries a 3/8-inch NPTF thread size, an inside diameter of 0.338 inches, and is rated for a maximum working pressure of 150 psi. The temperature range runs from -40 degrees F to 200 degrees F. Plumbers, HVAC technicians, and fluid system installers working with tube runs through enclosures or equipment panels are the primary users of this fitting.

This bulkhead union is suited for residential and commercial plumbing, HVAC, and pneumatic or hydraulic tube routing applications where tubing must pass cleanly through a structural surface. Its brass construction makes it compatible with typical copper or compatible synthetic tubing installations. It meets D.O.T. FMVSS571.106, SAE J1131, and SAE J246 standards, making it appropriate for applications requiring certified fluid-handling components. Single-unit packaging makes it practical for service calls and repair work where one fitting is needed.

Key Features

• Compression x compression end connections on both sides for tool-friendly, solder-free installation
• Brass construction provides corrosion resistance and durability in fluid-handling environments
• Rated to 150 psi maximum working pressure
• Wide service temperature range: -40 degrees F to 200 degrees F
• 3/8-inch NPTF thread size with 0.338-inch inside diameter
• Certified to D.O.T. FMVSS571.106, SAE J1131, and SAE J246 standards

Compatibility

Designed as an OEM-style replacement or service fitting for compression tube bulkhead union applications in plumbing, HVAC, and fluid transfer systems requiring a 3/8-inch NPTF connection with compression fittings on both ends.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Before installing or replacing this fitting, shut off the relevant fluid or pneumatic supply and depressurize the line completely. Compression fittings require proper tube squareness and seating of the ferrule against the fitting body — do not overtighten, as this can deform the ferrule and cause leaks. Always verify the tubing outside diameter is compatible with the fitting before final assembly.