4AN 1/4NPT to 2AN 1/8NPT Male Female Reducer

The 4AN 1/4NPT to 2AN 1/8NPT Male Female Reducer by REDHORSE PERFORMANCE is an essential hydraulic adapter for custom fuel, oil, and coolant line configurations in performance and modified vehicles. This reducer fitting bridges two different AN port sizes, allowing mechanics to step down from larger 4AN supply lines to smaller 2AN branch lines without compromising flow integrity or system pressure ratings. Built for serious enthusiasts who demand reliable connections in complex fuel injection, turbo cooling, and custom plumbing applications, this adapter eliminates the need for multiple fittings or workarounds.

This reducer features a male 1/4NPT port on the larger 4AN side and a female 1/8NPT port on the smaller 2AN side, allowing flexible orientation during installation depending on your specific line routing needs. The precision-engineered design maintains consistent wall thickness and internal passage diameters to prevent turbulence and pressure drops across the transition. REDHORSE PERFORMANCE fittings are manufactured to strict aerospace standards, ensuring durability under high-pressure fuel systems, boosted engine bays, and extreme temperature cycling common in turbocharged and supercharged applications.

This reducer works best for builders transitioning from main fuel lines to secondary regulators, gauge feeds, boost-referenced systems, or return lines in modified EFI setups. Its compact 2.75-inch length and lightweight design (0.05 lbs) fit tight engine bays where space is critical. Install using appropriate AN hose fittings and thread sealant on NPT ports to prevent leaks; compatibility spans all vehicles running aftermarket fuel systems, custom cooling circuits, or upgraded pneumatic boost controllers that require size-stepped connections.