Reducer AN -6 Female to -4 Male

The Reducer AN -6 Female to -4 Male is a precision straight-thread adapter fitting designed for high-pressure fluid systems where flow line sizes must be stepped down. Manufactured by ALLSTAR PERFORMANCE, this compact aluminum adapter is essential for custom fuel, oil, coolant, and hydraulic line configurations in racing, automotive, and powersports applications.

Constructed from lightweight aluminum and finished in black anodized, the Reducer AN -6 Female to -4 Male provides durability and resistance to oxidation, making it suitable for demanding engine bay environments. The straight-thread design minimizes turbulence and pressure drop across the size transition, ensuring efficient fluid flow.

This adapter is ideal for builders downsizing fuel or coolant lines, repositioning filter blocks, or adapting aftermarket component plumbing to original system architecture. It pairs seamlessly with braided stainless steel hose, hard-line tubing, and standard AN fittings across performance engines and custom hot rods.