Straight Adapter Fitting #4 x 3/8 MPT

The Straight Adapter Fitting #4 x 3/8 MPT by FRAGOLA is a precision hydraulic and fuel system connector designed to bridge two different port sizes in high-performance applications. This adapter serves as an essential transition piece for users who need to connect AN-sized components to standard NPT ports, making it ideal for custom fuel systems, hydraulic brake lines, and performance engine builds. Whether you're building a race-ready setup or maintaining critical fluid delivery systems, this fitting ensures reliable, leak-free connections across mismatched port configurations.

Constructed from aerospace-grade aluminum and finished with blue anodized coating, the Straight Adapter Fitting #4 x 3/8 MPT offers superior corrosion resistance and durability in demanding environments. The male-to-male configuration—with a #4 AN port on one end and 3/8-inch NPT male thread on the other—allows seamless integration without requiring additional adapters. The aluminum body keeps weight minimal while maintaining structural integrity under system pressure, and the anodized finish protects against oxidation and provides visual identification. Weighing just 0.03 lbs, this compact fitting (1.4 x 1.15 x 4.1 inches) fits easily into tight engine bays and fluid system enclosures.

Professionals and enthusiasts in motorsports, automotive restoration, and fluid system fabrication rely on FRAGOLA adapters for their consistent fit and proven performance under pressure. This fitting is particularly valuable when retrofitting older vehicles with modern fuel injection or hydraulic components, or when custom-fabricating systems that mix AN and NPT standards. Installation requires standard wrenches and basic plumbing knowledge; ensure proper thread sealant is applied to NPT connections for optimal leak prevention. Compatible with fuel, oil, and coolant systems, the Straight Adapter Fitting #4 x 3/8 MPT is a must-have inventory item for any serious shop or DIY builder.