8AN to 6AN(3/8)NPT Union Adapter 90

The 8AN to 6AN (3/8) NPT Union Adapter 90 from Redhorse Performance is an essential fitting for custom fuel system builds and turbocharger installations. This adapter is designed for mechanics working with modified engines and complex plumbing layouts, providing a critical junction piece that connects two different AN hose sizes while transitioning to NPT threaded ports.

Constructed from high-quality aluminum, this 90-degree union adapter is built to withstand the demands of fuel injection systems operating at 40+ PSI. Its design allows for space-efficient routing in tight engine bays, eliminating the need for multiple individual fittings and reducing potential leak points in systems under elevated fuel pressure or aggressive boost levels.

Ideal for custom fuel system builders and those upgrading turbo systems, the 8AN connection accommodates larger flow capacity on the primary line, while the 6AN (3/8) NPT side connects to aftermarket fuel rails, filters, or regulator ports. This makes the adapter perfect for stepped-down plumbing transitions where bulk fuel delivery narrows to precision component circuits.