#6 Male to 1/4in. NPT Ano-Tuff Adapter

The #6 Male to 1/4in. NPT Ano-Tuff Adapter by EARLS is a straight-port hydraulic fitting designed to bridge two different thread standards in high-pressure fluid systems. This adapter converts AN (Army-Navy) #6 male connections to National Pipe Thread (NPT) 1/4-inch male ports, making it essential for custom fuel, coolant, and brake line installations where legacy or mixed-standard plumbing is required. Whether building a classic hot rod, restoring vintage performance equipment, or adapting modern fuel systems to older engine bays, this fitting solves common compatibility challenges without requiring complete system redesign.

Constructed from aluminum and finished in black anodized coating, the Ano-Tuff Adapter resists corrosion while maintaining lightweight characteristics critical in motorsport and aircraft applications. The straight-port geometry ensures minimal turbulence and pressure loss across the transition, while the anodized surface provides a hard, wear-resistant layer that protects against oxidation and fluid degradation over time. The compact 1.25 x 0.8 x 2.9-inch form factor allows installation in tight engine compartment spaces without interference, and the precision machining ensures leak-free seals when paired with appropriate thread sealant or tape.

This adapter is ideal for fabricators, restoration specialists, and performance enthusiasts who regularly encounter mixed-thread legacy equipment or need to integrate modern fuel-injection systems into older platforms. Installation is straightforward: apply PTFE thread sealant to the NPT male end, thread into the 1/4-inch NPT port, then connect the AN #6 male hose or component. The aluminum construction keeps system weight down while the anodized finish ensures long service life in both street and competition environments where fuel system reliability is non-negotiable.