4AN to 4 AN Flare Union AN/AN

The 4AN to 4 AN Flare Union AN/AN adapter is an essential hydraulic fitting designed for high-performance fuel, oil, and coolant systems, particularly in racing, marine, and specialty automotive applications. This straight-through connector links two 4 AN male ports directly, streamlining installations and minimizing potential leak points in pressurized line assemblies.

Manufactured by REDHORSE PERFORMANCE, this adapter is made from lightweight aluminum and features a blue anodized finish for enhanced corrosion resistance and a polished look in engine bays. The flare union design utilizes a 37-degree JIC flare seat, which is the industry standard for AN fittings, ensuring a reliable metal-to-metal seal that can withstand high pressure without the need for rubber gaskets.

Ideal for builders upgrading fuel systems on LS, small-block, and modern turbocharged engines, as well as mechanics servicing aftermarket cooling circuits, this adapter simplifies installation with a straightforward wrench connection, requiring no special tools. Its compact size allows for easy integration into tight engine compartments, making it a practical choice for high-horsepower platforms.