4AN STR Male Adapter 3/8in NPT Male Blue

The 4AN STR Male Adapter 3/8in NPT Male Blue from Redhorse Performance is a precision hydraulic adapter designed for high-performance fuel, oil, and coolant line systems in modified vehicles. Built for enthusiasts and professional mechanics who demand reliable, leak-free connections in custom engine bay layouts, this adapter bridges AN (Army-Navy) fittings to NPT (National Pipe Thread) ports on engines, fuel pressure regulators, and accessory components. Whether you're upgrading a fuel system on a turbocharged build or integrating aftermarket gauges, this adapter ensures proper flow integrity under demanding conditions.

Constructed with precision engineering, this straight male adapter features a 4AN hose connection on one end and a 3/8-inch NPT male thread on the other, allowing seamless integration between AN-rated braided hose systems and standard NPT ports commonly found on factory or aftermarket components. The blue anodized aluminum finish not only provides corrosion resistance in engine bays exposed to heat and moisture but also serves as a visual identifier for coolant or water lines in color-coded system layouts. Redhorse Performance's quality machining ensures tight tolerances that prevent weeping or failure under sustained pressure, critical for turbocharged and supercharged applications where system reliability directly impacts engine safety.

This adapter is essential for builders integrating custom fuel delivery systems, remote oil filtration setups, or auxiliary cooling circuits where OEM port locations don't match modern hose routing needs. Mechanics and fabricators appreciate its compact 2.835-inch length and lightweight design (0.083 lbs), which simplifies installation in tight engine compartments without adding bulk or stress to adjacent components. Compatible with all 4AN braided hose and fittings, it pairs seamlessly with Redhorse Performance's full line of adapters and manifolds, making it a go-to choice for professional shops and dedicated enthusiasts building reliable, show-quality fuel and fluid systems.