4an Male to 4an Male w/1/8npt Hex

The 4AN Male to 4AN Male with 1/8 NPT Hex fitting from REDHORSE PERFORMANCE is a precision adapter designed for custom fuel, oil, and coolant line systems in high-performance automotive builds. Whether you're routing hardline systems through an engine bay, integrating auxiliary cooling circuits, or consolidating multiple hose connections, this adapter serves as a critical junction point in your vehicle's fluid delivery network. Built for the serious fabricator and engine builder, it bridges two 4AN male connections while simultaneously providing a 1/8 NPT port for pressure sensing, gauge installation, or secondary fluid access.

REDHORSE PERFORMANCE specializes in aircraft-grade aluminum and stainless steel fittings engineered to withstand high-pressure applications—exactly what modern turbocharged, supercharged, and nitrous-equipped engines demand. The 4AN size (1/4-inch tubing diameter equivalent) is industry standard for fuel pressure lines and auxiliary systems on vehicles producing 400+ horsepower, offering excellent flow rates while maintaining compact packaging. The hexagonal body design accommodates standard wrenches and prevents fitting rotation during installation, critical for leak-free sealing on pressurized systems. The integrated 1/8 NPT port allows you to tap in fuel pressure gauges, boost-sensing solenoids, or secondary fuel rails without requiring additional adapter chains.

This fitting excels in fuel system layouts, turbo oil supply and return circuits, and custom cooling loop configurations on street cars, race vehicles, and engine test stands. Installation requires standard hose crimping tools and AN-compliant push-lock or braided hose; ensure all connections use proper AN flare fittings or compression seals rated for your system's maximum operating pressure. The compact 2.835-inch length integrates seamlessly into tight engine bay environments without requiring complex rerouting. Mechanics and fabricators building fuel injection conversions, dual-fuel systems, or upgraded cooling architectures rely on REDHORSE fittings for their reliability and precision tolerances that prevent leaks under boost.