8AN ML to 3/8in NPT ML 1/8in NPT Hex Black

The 8AN ML to 3/8in NPT ML 1/8in NPT Hex Black adapter from REDHORSE PERFORMANCE is a precision hydraulic and fuel line fitting engineered for high-performance automotive, marine, and industrial applications. This straight adapter bridges two common port standards—8 AN male to 3/8 inch NPT male with an integrated 1/8 inch NPT female auxiliary port—making it indispensable for custom fuel systems, turbo kit installations, and pressure gauge integration on street rods, race vehicles, and marine engines. Builders and technicians rely on this fitting to simplify complex plumbing layouts without sacrificing flow integrity or system reliability.

Constructed from lightweight aluminum and finished in black anodized coating, this adapter resists corrosion and oxidation in both wet and dry environments while maintaining a professional appearance. The hex body design provides secure grip points for installation and removal using standard wrenches, eliminating the need for specialty tools. The straight-through configuration minimizes turbulence and pressure drop, critical when managing fuel delivery at high flow rates or integrating aftermarket fuel management components. Black anodizing also ensures compatibility with modern engine bay aesthetics common in custom and motorsport builds.

This fitting is ideal for EFI conversions, forced-induction fuel system upgrades, and custom plumbing where NPT female ports are required for gauge ports, relief valve feeds, or auxiliary sensor bosses. The dual-port design eliminates the need for separate tee fittings, saving space and reducing leak points in tight engine compartments. Compact dimensions (2.5 × 1.1 × 4 inches) and minimal weight (0.085 lbs) make it suitable for weight-conscious applications. Installation is straightforward with standard AN and NPT wrenches; use thread sealant appropriate for fuel applications to ensure lasting performance.