4AN Female to 6AN Male Expander Black

The 4AN Female to 6AN Male Expander in Black from REDHORSE PERFORMANCE is an essential adapter fitting for high-performance fuel, oil, and coolant systems where line diameter transitions are required. This expander adapter bridges the gap between 4AN and 6AN hose connections, allowing you to upgrade or modify your vehicle's fluid delivery system without replacing entire line runs. Whether you're building a custom fuel system, installing a turbo oil supply line, or expanding an existing cooling circuit, this adapter delivers reliable flow management in a compact, lightweight package.

Manufactured by REDHORSE PERFORMANCE, a leader in motorsport-grade hydraulic fittings, this expander features precision-engineered internal passages that minimize turbulence and pressure drop during fluid transition. The black anodized aluminum construction resists corrosion while maintaining compatibility with fuel, oil, coolant, and other automotive fluids commonly encountered in engine modifications. The 4AN female inlet accommodates standard 4AN hose or fittings, while the 6AN male outlet allows connection to larger-diameter 6AN lines, making system scaling straightforward for builders upgrading system capacity or flow requirements.

This adapter is ideal for fuel system builders, turbocharged engine specialists, and custom cooling system installers who need flexible port sizing without compromising durability. Installation is straightforward—simply connect the 4AN female port to your existing 4AN supply line and thread the 6AN male end into your 6AN destination component using appropriate thread sealant for fuel applications. The compact 2.8 x 1.1 x 4.05 inch profile and minimal 0.065 lb weight make integration into tight engine bay configurations practical, whether you're working on a street performance build, off-road modification, or race vehicle platform.