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 bridges AN -6 female swivel inlets to AN -4 male outlets, making it essential for custom fuel, oil, coolant, and hydraulic line configurations in racing, automotive, and powersports applications. The reducer fitting eliminates the need for custom fabrication or improvised connections that could compromise system integrity.

Constructed from lightweight aluminum and finished in black anodize, the Reducer AN -6 Female to -4 Male delivers corrosion resistance and durability in demanding engine bay environments. The straight-thread design minimizes turbulence and pressure drop across the size transition, while the swivel female end allows tool-free rotational adjustment during installation—critical for routing hoses in tight spaces without stressing fittings or hose assemblies. Black anodized aluminum construction resists oxidation while maintaining the professional appearance required on show vehicles and competition builds.

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, custom hot rods, and professional racing platforms. Each unit ships individually, allowing inventory stocking for production shops and high-volume installers. The compact 3.5 x 0.75 x 4.5 inch profile ensures installation in congested engine compartments without interference.