6AN ML to 3/8in NPT ML 1/8in NPT Hex Blue

The 6AN ML to 3/8in NPT ML 1/8in NPT Hex Blue adapter from REDHORSE PERFORMANCE is a precision fluid transfer fitting designed for high-performance fuel, oil, and coolant systems in motorsports and automotive applications. This straight-port adapter bridges two different connection standards—6 AN male threads to 3/8 inch NPT male threads—while providing a 1/8 inch NPT female port for gauge or monitoring equipment installation. Built for professionals and enthusiasts who demand reliability under pressure, this fitting eliminates the need for multiple adaptors and simplifies system plumbing.

Constructed from lightweight aluminum and finished in blue anodized coating, the 6AN ML to 3/8in NPT ML 1/8in NPT Hex Blue delivers corrosion resistance and durability in demanding engine bay environments. The hex body design ensures secure installation and removal using standard wrenches, while the straight configuration minimizes turbulence and pressure drop in fuel delivery or cooling circuits. The anodized finish not only protects against oxidation but also provides visual identification in color-coded fuel system setups, a critical safety feature in race vehicles and modified street cars where fluid type distinction is essential.

This adapter is ideal for builders transitioning between AN-standard fuel rails and NPT-threaded tank fittings, engine block ports, or manifolds common in both domestic and import platforms. The integrated 1/8 inch NPT female port allows direct mounting of fuel pressure gauges, temperature sensors, or diagnostic equipment without requiring additional tee fittings. Installation is straightforward: apply appropriate thread sealant to NPT ports, use the hex flats for wrench grip, and torque according to system specifications. Weighing just 0.08 lbs and measuring 2.95 x 1.1 x 3.85 inches, this compact fitting integrates seamlessly into tight engine compartments while maintaining the pressure integrity required for modern fuel injection and cooling systems.