4AN to 4AN 1/4NPT Straight Male to Male

The 4AN to 4AN 1/4NPT Straight Male to Male fitting by REDHORSE PERFORMANCE is an essential adapter for custom fuel, oil, and coolant line routing in high-performance engine builds and modified vehicles. Built to bridge -4 AN hose connections with 1/4 NPT male threads, this straight connector eliminates the need for multiple adapters and reduces potential leak points in your fuel system or auxiliary cooling loops. Whether you're fabricating a custom fuel system, installing an aftermarket oil cooler, or plumbing a supercharger intercooler setup, this fitting delivers the reliability and precision that serious engine builders demand.

Constructed from aerospace-grade aluminum with flawless male-to-male geometry, the 4AN to 4AN 1/4NPT fitting ensures zero flow restriction and consistent pressure integrity across high-performance applications. The straight design minimizes turbulence in fuel delivery and cooling circuits, critical for maintaining stable AFR (air-fuel ratio) and coolant temperatures under sustained boost or track conditions. REDHORSE PERFORMANCE fittings are manufactured to tight tolerances, with properly anodized surfaces that resist corrosion and maintain integrity even in salt-air or high-vibration environments typical of modified muscle cars, drag vehicles, and off-road trucks.

This adapter serves mechanics and fabricators building custom fuel systems, dual-stage fuel delivery setups, remote oil filtration kits, and cooler plumbing on turbocharged, supercharged, and naturally aspirated performance engines. Installation requires standard AN wrench sizes and compatible hose barbs or NPT-threaded components; dry-seal NPT tape is recommended for the 1/4NPT male side to prevent seepage. Compact at 2.75 inches in length and weighing just 0.05 lbs, it integrates seamlessly into tight engine bays without adding bulk or interference with intake manifolds or valve covers.