-4AN Female to 1/8inNPT Male Swivel Fitting

The -4AN Female to 1/8in NPT Male Swivel Fitting by Vibrant Performance is a precision hydraulic adapter designed for high-pressure fuel, oil, and coolant line applications where reliable connections are non-negotiable. This straight adapter bridges two industry-standard thread standards—AN (Army-Navy) and NPT (National Pipe Taper)—making it essential for custom fuel system builds, performance engine conversions, and industrial hydraulic setups. The swivel design allows for tool-free line rotation during installation, reducing stress on connected hoses and fittings while ensuring leak-free performance under demanding conditions.

Manufactured from aluminum and finished in black anodized coating, this fitting delivers both corrosion resistance and lightweight durability without sacrificing strength. The -4AN female port accepts standard 4AN hose barbs and line adapters, while the 1/8in NPT male connection threads directly into NPT-threaded ports, blocks, and manifolds. Anodization protects against oxidation and provides a professional appearance, while the aluminum construction keeps overall system weight minimal—critical for race, marine, and aviation applications where every gram counts. The swivel connection mechanism rotates freely on high-quality ball bearings, enabling precise alignment and eliminating the need for secondary wrenching during installation.

This adapter serves enthusiasts and professionals building custom fuel systems, turbo intercooler setups, remote oil filters, and vacuum distribution networks. It is particularly valuable when integrating aftermarket fuel rails, carburetors, or hydraulic control systems into platforms originally designed with different port standards. The swivel feature prevents hose kinking and reduces vibration-induced wear, extending hose life in high-vibration environments common to performance vehicles, off-road trucks, and industrial equipment. Installation is straightforward: hand-thread the NPT end into the target port, then attach 4AN hose with an appropriate barb fitting and hose clamp.