#4 > 3/8-24 Calip. Adapt

The EARLS #4 to 3/8-24 Caliber Adapter (SKU EAR591982ERL) is a straight-port AN fitting designed to connect 4 AN male ports to 3/8-24 inverted flare male ports in fluid transfer systems. This adapter bridges incompatible SAE port sizes commonly encountered in high-pressure hydraulic, fuel, and coolant applications where direct connection is not possible.

Constructed from steel with a zinc oxide finish, this adapter accommodates 3/16-inch hardline tubing and is supplied as a pair, making it ideal for symmetrical system configurations. The long-length straight design minimizes flow turbulence and pressure drop while maintaining seal integrity across the connection point. EARLS adapters are engineered to SAE J518 AN standards, ensuring compatibility with OEM and aftermarket fluid systems that require certified AN-to-inverted flare transitions. Zinc oxide plating provides corrosion resistance in damp or salt-air environments without adding significant weight—this pair weighs just 0.08 lbs combined.

This adapter fits applications where existing 4 AN ports must route to legacy or alternative 3/8-24 UNF inverted flare systems—common in vintage motorsports, marine fluid management, and industrial equipment retrofits. Users working with mixed-port plumbing layouts benefit from having matched pairs, eliminating the need to source singles separately and ensuring both connections meet identical pressure and seal specifications.

EARLS fittings are recognized across motorsports and high-performance fluid systems for precision manufacturing and reliability under sustained pressure. The 3/8-24 inverted flare standard ensures backward compatibility with systems predating modern AN standardization, making this adapter essential for restoration, upgrade, or mixed-generation system builds.