-4AN to 12mm x 1.0 Metri c Straight Adapter

The -4AN to 12mm x 1.0 Metric Straight Adapter from Vibrant Performance is a crucial hydraulic line connector designed for custom fuel, coolant, and brake system plumbing in modified vehicles. This adapter effectively connects AN (Army-Navy) threaded fittings to metric-sized ports commonly found on international engine blocks and aftermarket components.

Engineered with precision machining, this adapter meets OEM specifications for thread engagement and sealing surface integrity. The -4AN side, which corresponds to a 1/4 inch designation, accepts standard hose crimps and quick-disconnects, while the 12mm x 1.0 metric port threads directly onto factory or aftermarket components without modification. Its straight geometry minimizes turbulence in fuel and coolant lines, maintaining consistent pressure.

This compact adapter, weighing only 0.03 lbs, is ideal for tight engine bay installations where space is limited. Mechanics and fabricators frequently use this adapter when retrofitting metric-port fuel injectors, intercooler manifolds, or coolant bypass blocks into domestic vehicles with AN plumbing.