NPT Female Weld Bung 1/4in-18 Aluminum

The NPT Female Weld Bung 1/4in-18 Aluminum from ALLSTAR PERFORMANCE is a precision weld-on port adapter designed for fuel system, coolant line, and custom plumbing applications in race cars, hot rods, and performance vehicles. This aluminum bung provides a secure NPT female threaded inlet that allows installers to integrate gauges, sensors, or fluid transfer lines directly into custom welded panels or tanks. It serves as an essential component for builders who demand reliable, leak-free connections without compromising structural integrity or adding unnecessary weight.

Manufactured from lightweight aluminum with a natural finish, this weld bung features a 1/4 inch NPT (National Pipe Thread) female port and is purpose-built for permanent attachment via welding. The NPT 1/4in-18 thread specification ensures industry-standard compatibility with pressure gauges, sender units, and threaded fittings commonly found in performance fuel systems and cooling circuits. The compact design—measuring 4 x 0.7 x 7.05 inches and weighing just 0.07 lbs—facilitates installation in tight engine compartments while the aluminum construction resists corrosion and maintains thermal stability under high-performance conditions.

This bung is ideal for fabricators, engine builders, and motorsports enthusiasts constructing custom fuel systems, turbo intercooler setups, or auxiliary cooling loops. Installation requires welding to a compatible substrate—such as steel fuel cell walls, aluminum firewall patches, or radiator tanks—followed by attachment of NPT-threaded accessories. The natural aluminum finish provides a clean aesthetic while remaining compatible with both gasoline and coolant environments, making it a versatile choice for street machines, circle track competitors, and dedicated track vehicles requiring modular port access.