AN to NPT Straight #4 x 3/8

The AN to NPT Straight #4 x 3/8 adapter by Triple X Race Components is a precision hydraulic and fuel line fitting designed for high-performance engine systems, fuel injection setups, and custom automotive builds. This straight adapter bridges AN (Army-Navy) male threads to NPT (National Pipe Thread) male connections, making it essential for technicians and enthusiasts who need to integrate components with different threading standards. Whether you're plumbing a race engine, upgrading a fuel system, or assembling custom hydraulic circuits, this fitting ensures leak-free, reliable connections in demanding applications.

Manufactured from aluminum and finished in black anodized coating, this fitting combines lightweight construction with corrosion resistance and durability. The #4 AN (1/4-inch) to 3/8-inch NPT male configuration allows seamless thread adaptation without the need for multiple fittings or reducers. Black anodizing protects the aluminum from oxidation and wear while maintaining a professional appearance in engine bays and under-hood assemblies. The straight design eliminates flow restrictions and simplifies installation in tight spaces, making it ideal for custom fuel rails, intercooler lines, and transmission cooler circuits where compact routing is critical.

Racers, fabricators, and professional technicians rely on Triple X Race Components fittings for consistency and performance. This adapter is sold individually and works with any system requiring a direct AN-to-NPT male transition—common in fuel delivery, coolant systems, and custom plumbing where OEM components use mixed thread standards. Installation is straightforward: use appropriate wrenches or sockets to secure both ends, apply thread sealant tape or compound to the NPT end for added assurance, and torque to manufacturer specifications. Verify thread pitch and flow requirements before ordering to ensure compatibility with your specific application.