1/8inNPT Female Weld-On Bung

The 1/8in NPT Female Weld-On Bung by Moroso is an essential component for custom fuel system builds, oil lines, coolant circuits, and gauge installations on high-performance vehicles. Whether you're fabricating a custom fuel cell, adding aftermarket gauges, or routing auxiliary systems in an engine bay, this weld-on bung provides a clean, reliable entry point for NPT-threaded fittings. Designed for serious builders and DIY enthusiasts who demand precision and durability, this bung eliminates the need for tank cutting or destructive modifications—making it the preferred choice for restorations, race builds, and street performance applications.

The 1/8in NPT female thread accepts standard NPT-tapered fittings, adapters, and valves without requiring sealant tape or compound in most applications—the taper ensures a mechanical seal. The weld-on design allows mounting directly onto steel fuel tanks, coolant reservoirs, custom manifolds, or sandwich plate adapters, giving fabricators complete control over placement and angle. Moroso's quality construction ensures the bung won't crack, leak, or degrade under fuel, oil, coolant, or boost pressure exposure. The compact footprint (weighing just 0.06 lbs) and modest dimensions make it ideal for tight engine bay layouts where space is premium and clean integration matters.

Street rodders, engine swap specialists, and track enthusiasts benefit most from this bung when installing fuel pressure gauges, vacuum lines, boost controllers, or prototype fuel delivery systems. Install by TIG or MIG welding into a 1/8in hole drilled into the target surface—proper joint prep ensures a leak-free seal rated for sustained fuel system pressures. Compatible with any NPT-threaded fitting, this universal approach works across carbureted, fuel-injected, turbocharged, and supercharged platforms. For builders seeking a professional, code-compliant alternative to port fittings or sandwich blocks, the Moroso 1/8in NPT Female Weld-On Bung delivers simplicity, reliability, and long-term performance.