6AN to 8AN 1/2NPT Straight Male to Male

The 6AN to 8AN 1/2NPT Straight Male to Male fitting from REDHORSE PERFORMANCE is a precision-engineered hydraulic adapter designed for fuel system, coolant, and brake line modifications on performance vehicles. This adapter bridges two different AN (Army-Navy) hose sizes while maintaining a 1/2-inch NPT male port, making it essential for custom fuel injection setups, turbocharging installations, and engine swaps where existing line sizes must transition without leakage or flow restriction. Mechanics and engine builders rely on these fittings to ensure proper fuel delivery under high-pressure conditions and extreme operating temperatures.

Constructed from aircraft-grade aluminum with precision-machined threads, the 6AN to 8AN adapter features male-to-male straight configuration that eliminates weak points in your fuel or coolant circuit. The stepped design allows you to connect a smaller 6AN hose (3/8-inch inner diameter) to a larger 8AN line (1/2-inch inner diameter) while the 1/2NPT port accommodates standard SAE thread fittings found on fuel regulators, gauges, and distribution blocks. REDHORSE fittings are manufactured to tight tolerances and feature aggressive knurling for wrench-friendly installation, ensuring leak-free connections under pressures exceeding 3,000 PSI—critical for turbocharged and supercharged applications.

Engine builders upgrading fuel systems on LS-swap vehicles, EJ-platform Subarus, and JDM swaps frequently use this adapter to consolidate hose runs and adapt legacy fuel rails to modern high-flow injectors. Its compact 2.8 x 1.45 x 3.6-inch footprint makes it ideal for tight engine bays where space-saving connections are critical, and its lightweight 0.08 lb construction adds negligible weight to your fuel system. Compatible with both -6 and -8 braided steel and rubber hoses, this fitting works with ethanol blends, gasoline, and synthetic fuels, making it suitable for naturally aspirated and boosted applications alike.