6AN ML to 1/4in NPT ML 1/8in NPT Hex Black

The 6AN ML to 1/4in NPT ML 1/8in NPT Hex Black adapter from REDHORSE PERFORMANCE is an essential fluid line connector designed for serious automotive enthusiasts and professional mechanics tackling fuel system upgrades, custom cooling loops, and high-pressure hydraulic applications. This multi-port adapter solves the common challenge of bridging incompatible fitting standards on modern performance vehicles, eliminating the need for multiple separate adapters and reducing potential leak points. Built for reliability in demanding under-hood environments, this fitting serves as the critical link between your custom AN-lined fuel systems and factory or aftermarket NPT-threaded components.

The 6AN ML to 1/4in NPT ML 1/8in NPT Hex Black adapter features precision-machined black anodized aluminum construction, delivering superior corrosion resistance and durability across temperature swings and prolonged fuel or coolant exposure. The male AN (JIC) port accommodates standard -6 braided hose assemblies, while dual NPT ports—one 1/4-inch and one 1/8-inch—allow connection to metric or standard factory sensors, switches, and gauge ports without modification. The hex body design enables secure wrench grip during installation, preventing line twist and ensuring leak-free seated connections with proper torque. This adapter maintains flow integrity across high-pressure applications, critical for fuel delivery systems in turbocharged or supercharged builds where consistency is non-negotiable.

Street and track-focused builders commonly employ this adapter when converting OEM rubber fuel lines to braided steel, integrating aftermarket fuel pressure sensors on carbureted or EFI restorations, or plumbing remote oil cooler circuits on high-output engines. The compact 2.8 x 1.15 x 3.8-inch footprint fits tight engine bays where space constraints demand intelligent routing, while the feather-light 0.07-pound weight adds negligible mass to performance builds. Compatibility spans carburetor-fed classics upgraded with modern fuel injection, LS-swapped projects requiring auxiliary sensor bungs, and supercharger installations where intercooler fluid lines demand professional-grade NPT interfaces. Installation requires standard SAE -6 hose fittings and a 7/16-inch or 1/2-inch wrench, making this a straightforward retrofit for any competent DIY mechanic or shop environment.