Straight Adapter Fitting #4 x 3/8 MPT Black

The Straight Adapter Fitting #4 x 3/8 MPT Black from FRAGOLA is a precision hydraulic and fuel system connector designed for applications requiring a secure transition between 4 AN (Army Navy) male ports and 3/8 inch NPT (National Pipe Thread) male connections. This straight adapter fitting serves professionals and enthusiasts working on high-performance fuel systems, hydraulic lines, and custom automotive builds where reliable, leak-free connections are non-negotiable.

Constructed from aluminum with black anodized finish, this adapter combines lightweight durability with corrosion resistance and professional aesthetics. The 4 AN male end accommodates standard hose fittings and adapters common in race fuel systems and aftermarket hydraulic applications, while the 3/8 inch NPT male port threads directly into manifolds, regulators, and block ports using standard pipe thread specifications. The anodized coating protects against oxidation and provides a clean, finished appearance in engine compartments and fuel cell installations.

This fitting is ideal for technicians upgrading fuel delivery systems, installing aftermarket fuel pressure regulators, or adapting legacy hydraulic components to modern AN hose standards. The straight configuration eliminates unnecessary bends and pressure points, reducing turbulence and potential leakage under high-flow conditions. Installation requires only basic wrenching—thread sealant (PTFE tape or thread compound) on the NPT end ensures a tight seal, while the AN end connects directly to standard hose barbs or adapter fittings. Suitable for both gasoline and diesel applications, this adapter represents a cost-effective solution for custom plumbing needs.