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.

Constructed from aircraft-grade aluminum with precision-machined threads, the 6AN to 8AN adapter features a 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 (approximately 3/8-inch inner diameter) to a larger 8AN line (approximately 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 a maximum pressure rating of 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 enhance performance.