Inverted Flare Adapter Fitting -6AN to 1/2in-20

The Inverted Flare Adapter Fitting -6AN to 1/2in-20 by Vibrant Performance is a critical component for building high-flow fuel and fluid systems in custom automotive projects. This precision adapter bridges the gap between AN (Army-Navy) line standards and NPT (National Pipe Thread) connections, allowing you to integrate modern fuel injection systems, turbo supply lines, and braided stainless steel hose assemblies into vehicles where factory fittings don't align with your upgrade path. Whether you're converting a carbureted engine to EFI, installing a high-capacity fuel pump, or plumbing a custom turbocharger setup, this adapter ensures leak-free performance under pressure.

The inverted flare design creates a seal that seats concentrically against the female NPT port, reducing stress concentration and improving durability compared to straight adapters. The -6AN port accepts standard 3/8-inch hose with AN crimped fittings, while the 1/2-inch NPT 20 TPI female end threads directly into engine blocks, fuel rails, or manifold ports without additional adapters. Vibrant Performance manufactures this fitting from aerospace-grade materials that withstand fuel system pressure ratings and resist corrosion from ethanol blends and cooling system crossover environments. The compact design (3.54 × 0.75 × 6.3 inches) fits tight engine bays where space constraints demand minimal footprint, and at just 0.02 pounds, it adds negligible weight to your fuel system plumbing.

Mechanics and engine builders rely on this adapter for EFI retrofits, fuel cell installations, and turbocharger fuel supply lines where OEM connection points don't match modern aftermarket component threads. The 1/2-20 NPT sizing is standard across most LS engines, small-block Chevys, and Ford modular platforms, making this fitting universally compatible with popular swap combinations. Installation requires no special tools beyond a wrench for the AN side and standard NPT wrenches for the threaded port; apply appropriate thread sealant to the NPT end and torque to manufacturer specifications to ensure a dry system under full boost conditions.