12AN Bulkhead Adapter Straight Male Male Black

The 12AN Bulkhead Adapter Straight Male Male Black from Redhorse Performance is a precision-engineered hydraulic line connector designed for high-performance fuel, oil, and coolant system plumbing in modified vehicles. This adapter serves as a critical junction component in custom fuel injection systems, turbocharger feed lines, and engine bay fluid management applications where dual male AN connections are required on opposite sides of a firewall or bulkhead. Whether you're building a forced-induction engine package, retrofitting a modern fuel system into a classic platform, or integrating auxiliary cooling circuits, this straight-through bulkhead fitting provides the reliable, leak-free connection point that separates engine bay plumbing from cabin or frame-mounted equipment.

Redhorse Performance fittings are manufactured to SAE AN specifications with a straight male-to-male configuration that eliminates directional confusion during installation. The 12AN size handles substantial flow rates required by high-capacity fuel pumps, turbo oil supply lines, and intercooler circuits without restriction or pressure drop. The black anodized aluminum construction resists corrosion while providing positive visual identification in tight engine bays, and the precision-machined threads ensure consistent torque values across installations. The bulkhead design allows the adapter to function as both connector and structural spacer, maintaining precise line separation and reducing vibration-induced chafing that compromises welds and hose integrity over time.

Enthusiasts and professional engine builders rely on this adapter when installing fuel systems in supercharged or turbocharged builds, where symmetrical line routing and firewall penetration are non-negotiable design requirements. The compact 2.8 x 1.4 x 3.8 inch profile fits into confined spaces without sacrificing structural rigidity, and the lightweight 0.19 lb construction keeps pendulum mass low in high-vibration environments. Installation requires standard AN wrenches and thread sealant appropriate for your system media—fuel compatible sealant for fuel lines, or Teflon tape for oil circulation systems. Verify thread pitch compatibility with your existing AN components before assembly to ensure seamless integration into your custom hydraulic network.