Adapter Fitting Tall -4 to 1/8in Straight

The Adapter Fitting Tall -4 to 1/8in Straight by ALLSTAR PERFORMANCE is a precision hydraulic and pneumatic adapter designed to bridge two different port sizes and thread standards in high-pressure fluid systems. This component is essential for custom plumbing applications in performance vehicles, race cars, and industrial equipment where AN (Army-Navy) fittings must connect to NPT (National Pipe Thread) ports. Whether you're building a custom fuel system, brake line configuration, or pneumatic control circuit, this adapter provides a reliable, leak-free transition between incompatible connection standards.

Manufactured from steel and finished with a zinc oxide protective coating, the Adapter Fitting Tall -4 to 1/8in Straight features a -4 AN male port on one end and a 1/8 inch NPT male port on the other, allowing secure integration into systems using both metric and imperial specifications. The straight configuration (as opposed to 45° or 90° elbows) enables direct in-line installation in tight or straight-run applications. Steel construction ensures durability under pressure, while the zinc oxide finish resists corrosion in engine bays and harsh environments. The tall design accommodates deeper or recessed port configurations where standard fittings may not seat properly.

This adapter is ideal for fabricators, restoration specialists, and performance technicians who need to retrofit or modify fuel, oil, coolant, or air systems on classic and modern vehicles. Installation requires appropriate AN and NPT wrenches or sockets—hand-tightening alone will not achieve proper sealing. For maximum reliability, apply thread sealant (PTFE tape or liquid sealant rated for your fluid type) to the NPT threads before assembly. Verify pressure ratings and fluid compatibility with your system specifications before installation.