6AN Male to M14x1.5 O-Ring Aluminum Black

The 6AN Male to M14x1.5 O-Ring Aluminum Black fitting by Redhorse Performance is a precision adapter engineered for custom fuel and fluid transfer systems in modified vehicles. Designed for builders and mechanics who demand reliable, leak-free connections between AN (Army-Navy) hose and metric threaded ports, this adapter bridges two critical standards commonly found in high-performance engine builds, turbo installations, and fuel system upgrades. Whether you're plumbing a fuel pressure regulator, oil cooler, or intercooler system, this fitting ensures compatibility across platforms and eliminates the need for custom fabrication.

This adapter features a 6AN male port (0.75-inch nominal diameter) on one end and an M14x1.5 metric female thread on the other, allowing seamless integration into European and Japanese engine bays where M14 ports are standard. The o-ring groove is machined to industry specifications, ensuring a gas-tight seal when properly torqued, eliminating labor-intensive teflon tape workarounds. Constructed from lightweight aluminum and finished in black anodize, the fitting resists corrosion while minimizing system weight—critical for both street and track applications. The compact 2.84 x 1.1 x 4.42-inch footprint makes it ideal for tight engine compartments where space is precious.

High-performance tuners working on BMW, Mercedes, and turbocharged import platforms benefit most from this adapter, as it bridges the gap between aftermarket AN-spec fuel and cooling lines and OEM metric threaded ports. Professional mechanics value this fitting for its straightforward installation—hand-tighten the o-ring fitting, then torque to spec—and its ability to reduce leak points in complex custom systems. Verify thread engagement length and port depth before installation to ensure proper seating and avoid over-torquing, which can compromise the aluminum body or damage the o-ring seat.