#4 Stl Flare to 1/8 NPT Long

The #4 Stl Flare to 1/8 NPT Long adapter fitting is a critical component for any serious boater or angler running pressurized fuel, cooling, or hydraulic systems on the water. This XRP-Xtreme Racing Products adapter bridges AN (Army-Navy) and NPT (National Pipe Thread) connections, making it essential when integrating aftermarket fuel systems, custom cooling loops, or high-performance marine engines. Whether you're upgrading a performance boat or maintaining reliable fuel delivery on extended trips offshore, this straight adapter ensures leak-free, pressure-rated connections where mismatched thread types meet.

Manufactured from nickel-plated steel, the #4 Stl Flare to 1/8 NPT Long fitting delivers corrosion resistance critical in saltwater and freshwater environments alike. The 4 AN male flare end connects to industry-standard flared hose, while the 1/8-inch NPT male port threads into manifolds, fuel blocks, or engine ports with confidence and precision. XRP's long-format design provides additional standoff, reducing sharp bends in tight engine compartments and extending hose life by minimizing fatigue at the connection point—a proven advantage in high-vibration marine applications where standard fittings fail prematurely.

Anglers running custom fuel systems, high-horsepower outboards, or inboard-outboard marine engines benefit most from this adapter's reliability and pressure rating. Boaters upgrading from original equipment manufacturer fuel lines to performance fuel injection systems, or those installing aftermarket water pumps and coolers, will appreciate the secure, repeatable seal that AN/NPT adapters provide. Verify thread port compatibility on your fuel block, carb inlet, or manifold before ordering—NPT ports are standard on many marine engine components, making this long-body adapter an ideal solution for custom marine fuel and cooling system builds.