6AN to 4AN Reducer Black Female Male

The 6AN to 4AN Reducer Black Female Male fitting from REDHORSE PERFORMANCE is an essential adapter for custom fuel system, coolant line, and hydraulic brake builds where line size transitions are necessary. Whether you're downsizing from larger diameter hose runs to smaller branch lines or consolidating multiple feed sources into a single outlet, this reducer fitting handles the job with precision and reliability. Mechanics and fabricators rely on these adapters to bridge incompatible hose sizes without compromising flow integrity or introducing weak points in high-pressure systems.

Machined from aerospace-grade aluminum, the 6AN to 4AN reducer features a black anodized finish that resists corrosion and provides a clean, professional appearance under the hood. The female inlet (6AN port) accepts larger diameter hose or line connections, while the male outlet (4AN) threads directly into smaller fittings, carburetors, fuel regulators, or distribution blocks. The dual-port design and precision SAE thread engagement ensure a leak-free seal without requiring thread-sealant tape, though Teflon tape application is recommended for optimal reliability in high-vibration environments typical of performance and racing applications.

This reducer is indispensable for fuel system conversions, carbureted-to-EFI swaps, custom radiator cooling loops, and any plumbing scenario where AN line sizing transitions must occur. Its compact footprint (2.8 x 1.05 x 3.8 inches) makes it ideal for tight engine bays where space is at a premium. The minimal weight (0.05 lbs) ensures no impact on vehicle dynamics while maintaining full compatibility with standard -6 and -4 hose assemblies, braided lines, and rapid-disconnect couplers commonly found in street rod, drag racing, and performance street builds.