8AN to 6AN(3/8)NPT Adapter 45

The 8AN to 6AN (3/8) NPT adapter 45 by Redhorse Performance is a precision adapter fitting engineered for custom fuel, coolant, and hydraulic line routing in high-performance engine builds. Whether you're upgrading a carbureted street machine, tuning a modern EFI swap, or fabricating a custom cooling system, this 45-degree angled adapter bridges metric AN hose sizing to NPT threaded ports with reliable, leak-free connections. Serious engine builders and fabricators depend on Redhorse Performance adapters to simplify complex plumbing without sacrificing pressure integrity or aesthetic cleanlines.

This adapter accepts 8AN hose—commonly used in fuel delivery and return lines on turbocharged and supercharged applications—and transitions it to a 6AN (3/8-inch NPT) threaded port on components like fuel pressure regulators, water bypass blocks, or transmission coolers. The 45-degree elbow geometry reduces stress on hose crimps at sharp bends, improving durability during engine vibration and thermal cycling. Redhorse Performance adapters are precision-machined aluminum or ductile iron, finished with durable anodizing or plating to withstand fuel, oil, and coolant exposure while maintaining tight tolerances that eliminate weeping at critical junctures.

This fitting is ideal for custom fuel system builds, engine transplants, and modular cooling upgrades where OEM hard-line ports must be adapted for flexible hose routing. It suits hot rod, muscle car, import drift, and motorsport fabrication where space constraints or engine bay redesigns demand angled connections. Ensure your system's working pressure matches the adapter rating, and always use proper AN hose crimpers and NPT thread sealant to achieve leak-free performance. Compact at 2.8 x 1.1 x 3.8 inches and weighing just 0.08 lbs, this adapter installs quickly and fits tight engine compartments without bulk.