-4AN to 10mm x 1.25 Metr ic Straight Adapter

The -4AN to 10mm x 1.25 Metric Straight Adapter from Vibrant Performance is a precision hose fitting engineered for fuel, oil, coolant, and vacuum line routing in modern performance and modified vehicles. This adapter bridges AN (Army-Navy) standard -4 hose sizing with metric 10mm x 1.25 threaded ports, making it essential for builders integrating aftermarket fuel systems, turbo setups, custom cooling loops, or engine management components. Whether you're upgrading a turbocharged engine, installing an auxiliary fuel system, or fabricating a custom cooling circuit, this straight adapter delivers a leak-free connection without the complexity of multi-stage fittings.

Vibrant Performance fittings are manufactured to tight tolerances and feature forged brass construction that resists corrosion and handles sustained pressure cycles in demanding engine bay environments. The straight configuration (zero bend angle) simplifies line routing in tight spaces and reduces turbulence in fuel and coolant circuits, improving flow efficiency and system responsiveness. The 10mm x 1.25 metric thread pitch mates seamlessly with OEM and aftermarket components common in import and performance platforms, while the -4AN hose interface accepts standard braided stainless or PTFE-lined hose with JIC-style swaged ends, ensuring compatibility across your entire fuel or cooling system architecture.

Engine builders, turbo installers, and fuel system integrators rely on this adapter when converting between domestic AN standards and metric component sizing found on many Japanese, European, and modern EFI platforms. Installation requires only basic wrenching—secure the 10mm threaded end into your metric port using an appropriate wrench or socket, then attach your -4AN hose with a hose clamp or crimp-style JIC end fitting. The compact design (3.2 x 0.8 x 3.75 inches) fits snugly in engine bay plumbing layouts without adding bulk, and the lightweight aluminum-brass construction (0.02 lbs) contributes negligibly to overall system weight. Verify metric port thread depth and hose ID before ordering to ensure proper fitment in your specific application.