#4 An Flare To 1/2in Pipe

The #4 AN Flare to 1/2in Pipe fitting from Aeroquip is an essential adapter for high-performance fuel and fluid systems in custom engine builds and modified vehicles. This fitting bridges AN (Army-Navy) flare connections to standard NPT pipe threads, making it a versatile choice for mechanics and automotive enthusiasts.

Designed to handle both low and high-pressure applications, this fitting features a 37-degree flare seat that locks fuel or hydraulic fluid tightly. The 1/2-inch NPT pipe thread end allows for direct connection to engine block fittings, fuel rails, or manifold ports without requiring additional adapters, enhancing system reliability.

Custom builders prefer this fitting for LS engine conversions and carbureted fuel system installations, where modern EFI systems must interface with legacy manifold ports. Its compact size and reliable performance make it a critical component for ensuring optimal fuel system functionality.