Reducer AN Male -10 to -12

The Reducer AN Male -10 to -12 from ALLSTAR PERFORMANCE is a precision adapter fitting designed for high-performance fuel and coolant line systems in engine builds and aftermarket fuel injection setups. This straight-through reducer steps down from -12 AN (3/4-inch) port size to -10 AN (5/8-inch), making it essential for custom plumbing when connecting larger-diameter hard lines to smaller component ports. Whether you're building a fuel system for a naturally aspirated street engine or a turbocharged race car, this adapter eliminates the need for costly component replacements and allows flexible mixing of OEM and aftermarket manifold sizes.

Machined from lightweight aluminum and finished in black anodize, this fitting resists corrosion and maintains structural integrity under high fuel pressure and thermal cycling. The straight configuration minimizes turbulence and pressure drop compared to elbows, critical for fuel delivery consistency and injector response. Its compact form factor (2.35 x 1.6 x 4.1 inches) fits tight engine bay layouts without requiring extensive routing rework. The -10 and -12 AN male threads ensure leak-free connections when paired with matching female ports or adapter sockets, and the anodized finish protects against galvanic corrosion in mixed-metal systems common in modified engines.

Mechanics and engine builders rely on this reducer when retrofitting fuel rails, installing aftermarket regulators, or adapting manifolds from different manufacturers. It's ideal for carbureted-to-EFI conversions, fuel system upgrades, and custom coolant bypass circuits. Verify your system's pressure rating (typically 100+ PSI for fuel applications) before installation, and use quality Teflon tape or thread sealant on all connections. This single-unit fitting is compatible with any SAE -10 AN and -12 AN component pair, making it a versatile addition to any performance shop's adapter inventory.