Banjo 4an > 3/8in

The Banjo 4AN > 3/8in fitting from Earls is an essential adapter for any serious fuel system build or hydraulic line configuration where size reduction is required. This banjo-style connector allows you to step down from a larger 4AN (AN4) line to a smaller 3/8-inch port, making it ideal for connecting to fuel filters, carburetors, regulators, or engine bay components with tighter port configurations.

Engineered from aluminum or steel, this adapter features precision-machined sealing surfaces that create a reliable connection without the complexity of additional adapters. The banjo design incorporates a bolt-through eyelet that accepts a single bolt with two O-ring seals—one on each side of the banjo body—to prevent fluid weeping at the junction. This design is favored for its ability to handle moderate pressure without thread-stripping risk.

Technicians and DIY enthusiasts benefit most from this adapter when retrofitting fuel systems, converting carbureted engines to fuel injection, or building custom hydraulic setups. The 4AN to 3/8-inch step-down ratio is commonly used when transitioning from modern AN braided hose systems to OEM-style threaded ports found on classic carburetors or mechanical fuel regulators.