NPT Female Weld Bung 3/8in-18 Aluminum

The NPT Female Weld Bung 3/8in-18 Aluminum is a precision-engineered welding component designed for applications requiring fluid or gas passage integration into steel tanks, manifolds, and custom fabrications. Built by ALLSTAR PERFORMANCE, this weld bung serves as a permanent mounting point for fuel lines, coolant circuits, vacuum systems, and instrumentation ports in automotive, marine, and industrial projects. Its NPT (National Pipe Thread) female connection ensures secure, leak-proof compatibility with standard threaded fittings and sensors.

Constructed from lightweight aluminum, the 3/8-inch NPT Female Weld Bung features a weld-on base that fuses directly into parent metal during welding, eliminating the need for separate fasteners or adhesives. The natural aluminum finish resists light corrosion and provides an economical yet durable solution for custom tank builds and prototype development. The 3/8-inch NPT female threads accept standard pipe plugs, adapters, and sensor bungs, allowing versatile plumbing configurations without modifying the bung itself. Its compact design—measuring 4 × 0.75 × 7.05 inches and weighing just 0.07 lbs—minimizes material waste and fits tight layout constraints in engine bays and chassis applications.

Fabricators, hot rod builders, and automotive engineers favor this weld bung for custom fuel tank construction, forced induction cooling loops, and aftermarket fuel system installations where OEM bungs do not exist. It is ideal for welding into aluminum or steel tank walls before pressurization testing, allowing safe attachment of fuel level senders, temperature sensors, or adapter ports. Installation requires standard TIG or MIG welding equipment and basic metal fabrication skills; proper surface preparation and heat management ensure reliable, code-compliant welds for street and competition vehicles.