4AN Female to 3AN Male Reducer Clear

The 4AN Female to 3AN Male Reducer Clear from REDHORSE PERFORMANCE is an essential hydraulic adapter for fuel systems, coolant lines, and brake circuits where line diameter reduction is required. This fitting bridges the gap between larger 4AN hose assemblies and smaller 3AN components, eliminating the need for custom fabrication or workarounds on tight engine bays. Whether you're building a custom fuel cell setup, downsizing fuel rail plumbing, or adapting OEM hydraulic lines to aftermarket systems, this reducer gives you the flexibility to integrate different AN-sized components seamlessly into your build.

Manufactured to REDHORSE PERFORMANCE's engineering standards, the 4AN Female to 3AN Male Reducer features a clear anodized finish that resists corrosion and allows visual inspection of fluid flow or debris accumulation—critical when troubleshooting fuel or cooling system issues. The aluminum construction keeps weight minimal at 0.055 lbs, ideal for weight-conscious builds, while the precision-machined threads ensure leak-free pressure retention across full operating range. The female 4AN inlet accepts standard 4AN hose with -4 sizing (16mm outer diameter), while the male 3AN outlet (10mm OD) threads directly into -3 fittings, blocks, or manifolds without adapter stacking.

This reducer serves mechanics and fabricators working on fuel injection conversions, turbo system plumbing, hydraulic brake upgrades, and custom cooling loops where AN-line standardization streamlines the build process. It's compatible with any SAE J518 compliant AN hose and fitting ecosystem—meaning it works across fuel, oil, coolant, and brake applications without compatibility concerns. For street cars, race vehicles, and off-road platforms alike, keeping a selection of AN reducers on hand eliminates costly delays and rework when component sizing doesn't align perfectly with your manifold or block configuration.