6AN to 4AN 1/4NPT Straight Male to Male

The 6AN to 4AN 1/4NPT Straight Male to Male fitting by REDHORSE PERFORMANCE is an essential adapter for custom fuel, coolant, and hydraulic line routing in high-performance automotive builds. This reducer fitting bridges two different AN port sizes while incorporating 1/4" NPT male threading, making it indispensable for engine bay plumbing where line consolidation or system reconfiguration is required.

Constructed with precision machining, the straight male-to-male design eliminates unnecessary bends and reduces turbulence in fuel delivery or coolant circulation systems. The 6AN inlet accepts larger diameter hose (typically -6 rated) while the 4AN outlet reduces to smaller hose capacity (-4 rated), allowing mechanics to step down system pressure safely or adapt legacy plumbing to modern components.

This compact adapter ensures leak-free connections between incompatible hose sizes without compromising flow integrity. It serves professional mechanics, engine builders, and dedicated enthusiasts upgrading fuel systems, turbocharged engines, or integrating custom cooling loops.