Reducer AN -4 Female to -3 Male

The ALLSTAR PERFORMANCE Reducer AN -4 Female to -3 Male is a straight adapter fitting designed to connect larger -4 AN (1/2-inch) hose lines to smaller -3 AN (3/8-inch) ports and components. This aluminum adapter with black anodized finish provides a permanent, leak-free interface in fuel systems, coolant lines, and hydraulic circuits where port size mismatches occur. The straight configuration eliminates flow turbulence and pressure loss compared to angled alternatives.

Constructed from lightweight aluminum and finished in black anodize, this adapter combines corrosion resistance with minimal weight—ideal for racing, performance, and off-road applications where system reliability is critical. The female swivel end on the larger bore accepts -4 AN hose fittings with full 360-degree rotational freedom, reducing installation stress on connected hose assemblies. The fixed male port on the -3 AN side threads directly into component ports without additional adapters. The compact 2.05-inch length allows placement in confined engine bays and tight routing scenarios.

This reducer is essential for builders transitioning between different AN port standards within a single system—common in custom fuel systems, cooling upgrades, and hydraulic brake installations. Racers and street performance enthusiasts rely on ALLSTAR PERFORMANCE fittings for their proven durability under sustained pressure cycling. The black anodized finish withstands engine heat and resists oxidation in high-moisture environments, ensuring long service life with minimal maintenance.

Each adapter is sold individually. Verify thread pitch and port sizing before installation to ensure proper fit. Compatible with standard -3 and -4 AN hose assemblies and port threads across automotive, marine, and industrial fluid systems.