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

The EARLS #4 Male to 1/4in NPT Ano-Tuff Adapter is a straight-port fitting designed to bridge #4 AN male ports to 1/4 inch NPT male connections in high-pressure fluid systems. Manufactured from aluminum with black anodized finish, this adapter delivers reliable thread compatibility while resisting corrosion in demanding environments. The Ano-Tuff anodized coating enhances durability against oxidation and surface wear—critical for systems exposed to moisture, thermal cycling, or aggressive fluid media.

The adapter's straight configuration ensures minimal turbulence and pressure drop across the transition, making it suitable for fuel systems, hydraulic lines, and pneumatic applications where flow efficiency matters. The #4 AN male end (5/16-24 thread) mates with standard -4 hose fittings, while the 1/4 NPT male end accepts NPT female ports found on many industrial and automotive components. Aluminum construction keeps weight minimal—0.02 lbs—without sacrificing structural integrity under rated pressure conditions. The compact 3.05-inch length fits tight engine bays and equipment enclosures where space is constrained.

This adapter is essential for builders and technicians integrating modern AN-style hose assemblies into systems with legacy NPT porting, or for retrofit applications where AN components offer superior flow characteristics and vibration resistance compared to older fittings. Common uses include fuel cell installations, custom cooling loops, turbocharger supply lines, and hydraulic brake system modifications. The black anodized finish integrates visually with modern engine bay aesthetics while providing a hard, protective surface layer that resists wear from vibration and thermal stress.