Fitting 1/2 NPT x 5/8 Barb Straight Brass

The Moroso Fitting 1/2 NPT x 5/8 Barb Straight Brass is an essential fluid transfer component designed for custom automotive cooling, fuel, and vacuum line systems. Built by Moroso, a trusted name in performance engine modifications, this straight brass fitting bridges between rigid NPT-threaded ports and flexible barbed hose connections. Whether you're fabricating a custom radiator setup, upgrading your fuel delivery system, or routing breather lines on a modified engine, this fitting provides the reliable transition point your build demands.

Engineered from solid brass, this straight adapter resists corrosion and maintains its integrity under engine bay temperatures and fluid exposure. The 1/2 NPT male thread end connects to threaded ports on water pumps, thermostats, heater control valves, and fuel system components, while the 5/8-inch barbed outlet accommodates common hose sizes used in performance cooling loops and fuel lines. The straight design—as opposed to 90-degree or 45-degree configurations—simplifies installation in tight engine compartments and reduces turbulence in fluid flow, a critical consideration when optimizing circulation efficiency in custom cooling systems or high-flow fuel delivery setups.

This fitting is ideal for fabricators, engine builders, and enthusiasts working on street rods, LS swaps, vintage restorations, and race car builds where OEM hose configurations don't fit the modified layout. The compact 3.75-inch overall length and lightweight 0.15-pound construction make it a practical choice for space-constrained applications without adding meaningful weight or complexity. Installation requires only a wrench on the NPT end and proper hose clamps on the barbed outlet; ensure the mating port is clean and use thread sealant tape (PTFE) on the 1/2 NPT threads to prevent leaks under pressure. Pair this fitting with quality fuel-grade or coolant hose rated for your system's operating temperature and pressure for maximum reliability.