8AN ML to 3/8in NPT ML 1/8in NPT Hex Black

The 8AN ML to 3/8in NPT ML 1/8in NPT Hex Black adapter from REDHORSE PERFORMANCE is a precision fluid line connector engineered for high-performance fuel, coolant, and hydraulic system applications in custom automotive builds. This adapter bridges two critical industrial-standard thread sizes, allowing you to transition from 8AN male lines to both 3/8-inch NPT male and 1/8-inch NPT male ports in a single compact unit. It's an essential component for engine bay plumbing in turbocharged, supercharged, and fuel-injected vehicles where precise fluid routing and leak-free connections are non-negotiable.

Constructed from aluminum and finished in corrosion-resistant black anodize, this hex-body adapter resists vibration-induced loosening and delivers consistent sealing performance under pressure cycling. The dual-outlet design—3/8in NPT male and 1/8in NPT male threads—accommodates simultaneous connections to gauge ports, pressure relief lines, or secondary fuel delivery circuits without requiring additional manifolds. The AN (Army-Navy) JIC flare standard on the input ensures compatibility with modern -8 braided stainless steel hose lines, while the NPT male outputs provide reliable connections to factory and aftermarket sensors, regulators, and distribution blocks. Hex geometry allows full tool engagement, preventing rounding damage during installation and maintenance.

This adapter excels in race-car fuel systems, LS engine swaps, and fuel cell plumbing where you need to consolidate pressure ports and sensor bungs into a single clean transition point. Custom fabricators and high-performance shops rely on REDHORSE adapters to eliminate bulky manifold blocks and reduce weight in the engine bay. Lightweight at 0.085 lbs and compact (2.5 x 1.1 x 4 inches), it's ideal for tight turbo installations, drift cars, and street machines running aftermarket fuel rails or custom carbureted systems. Always pair with appropriate thread sealant (PTFE tape or anaerobic compound) on NPT connections to ensure lasting pressure integrity under full boost conditions.