Blkhd Union #6an to #6an Fitting

The Blkhd Union #6an to #6an Fitting (AEROQUIP FCM2774) is a straight bulkhead connector designed for high-pressure hydraulic and fuel line systems in performance automotive and industrial applications. This fitting serves as a panel-mount union that allows two 6 AN male hose ends to connect through a solid barrier—such as a firewall, frame rail, or engine bay partition—without compromising system integrity. Builders and mechanics rely on bulkhead fittings when routing custom fuel, coolant, or brake lines through tight compartments where traditional fittings cannot physically reach on both sides of a barrier.

Manufactured from steel with a zinc-oxide finish, this bulkhead union delivers corrosion resistance and durability in engine bay and underbody environments where salt spray and thermal cycling are constant threats. The 6 AN port size accommodates flow rates suitable for high-displacement fuel systems, turbocharger supply/return lines, and custom cooling circuits commonly found in motorsports and street performance builds. The straight configuration minimizes turbulence and pressure drop compared to elbow designs, preserving system efficiency in fuel injection, forced induction, and closed-loop cooling applications. Zinc-oxide plating ensures long service life while maintaining a clean aesthetic in exposed installations.

This fitting is essential for custom engine swaps, turbocharged conversions, and dedicated fuel system builds where factory routing no longer applies. Engine builders and fabricators use bulkhead unions to seal pass-throughs on custom fuel tanks, remote-mounted fuel cells, and aluminum firewall panels, ensuring leak-free operation under high pressure and vibration. The compact 2.35 × 1.1 × 3.75 inch form factor fits tight firewall and frame cutouts, making it ideal for race cars, restorations with modern drivetrains, and street machines with relocated fuel systems. Verify 6 AN male thread compatibility on both hose ends and confirm the panel thickness accommodates the union's installation depth before ordering.