12AN Male to 6AN Male Reducer Black

The 12AN Male to 6AN Male Reducer Black from Redhorse Performance is an essential hydraulic line adapter for high-performance fuel, oil, and coolant systems where step-down fitting integration is required. This reducer bridges the gap between larger 12AN ports and smaller 6AN line requirements, making it indispensable for custom fuel injection setups, turbo cooling circuits, and precision engine bay plumbing. Whether you're building a street performance engine, upgrading fuel delivery on a carbureted application, or installing aftermarket turbocharger coolers, a properly matched reducer prevents leaks, maintains system integrity, and eliminates the need for improvised adapter stacks that compromise reliability.

Manufactured by Redhorse Performance—a trusted name in motorsports hydraulic solutions—this black anodized aluminum reducer features precision-engineered male threads on both ends (12AN inlet, 6AN outlet) that seat securely without thread sealant tape when used with O-ring equipped fittings. The compact 2.85-inch overall length and lightweight 0.13-pound profile make it ideal for tight engine compartments where space constraints demand efficient line routing. Black anodizing provides both corrosion resistance and a clean aesthetic, while the rigid aluminum construction ensures zero flex under pressure cycles, critical for maintaining consistent fuel pressure in carbureted or fuel-injected engines operating at 40+ PSI.

This reducer is ideal for mechanics and engine builders executing custom fuel system architectures, turbo cooling lines, or transmission cooler installations where AN-size standardization prevents cross-threading and system failures. It pairs seamlessly with Redhorse braided PTFE hoses, -12AN banjo bolts, and block-mounted sandwich adapters, allowing you to downsize flow while maintaining full system pressure rating. Installation is straightforward—thread the 12AN inlet into your primary component or manifold block, then connect your 6AN braided hose to the outlet using appropriate AN-sized hose ends. Always use fresh O-rings on reusable fittings and verify thread engagement to eliminate weeping and ensure durability across seasons of hard driving.