3AN STR Male Adapter 1/4in NPT Male Clear

The 3AN STR Male Adapter 1/4in NPT Male Clear from REDHORSE PERFORMANCE is a precision fluid-line connector engineered for high-performance automotive systems including fuel delivery, coolant bypass, oil cooling circuits, and custom hydraulic modifications. This adapter serves as a critical bridge component in builds where AN (Army-Navy) standard hose fittings must interface with NPT (National Pipe Thread) ports found on factory or aftermarket manifolds, blocks, and radiators. Whether you're routing fuel rails on a turbocharged engine, installing a secondary oil cooler, or integrating a fuel surge tank into a race platform, this male-to-male straight adapter eliminates the need for multiple fitting components and reduces leak points in your pressurized system.

Manufactured by REDHORSE PERFORMANCE, a recognized leader in aerospace-grade AN fittings, this adapter features a straight (STR) configuration with a 3AN hose end on one side and a 1/4-inch NPT male port on the other, allowing direct thread-in installation to aluminum or cast-iron ports without additional adapters. The clear anodized finish provides corrosion resistance while maintaining visibility for flow inspection and system diagnostics—critical when troubleshooting fuel delivery or cooling performance. The compact 2.85 x 1.1 x 3.8-inch profile and minimal 0.05-pound weight ensure it won't add bulk or vibration to engine bay layouts, and the robust construction withstands continuous pressure cycles in both street and competition applications.

This adapter is ideal for engine builders, fuel system integrators, and performance enthusiasts modifying vehicles with custom fuel rails, remote oil coolers, or upgraded coolant passages that require NPT-threaded entry points. Installation requires only a wrench or hose-end tool and thread sealant appropriate for the fluid being run—typically PTFE tape or anaerobic compound for fuel systems. Verify your AN hose size matches the 3AN rating and confirm NPT thread compatibility on your manifold or block before ordering; this adapter works seamlessly with standard automotive fuels, coolant, and compatible hydraulic fluids at pressures typical of street and mild racing platforms.