3/8 FPT Weld Bung x .750in

The 3/8 FPT Weld Bung x .750in from FRAGOLA is a precision-engineered aluminum weld-on fitting designed for fuel system and fluid transfer applications where a secure, permanent connection is required. This bung accommodates standard 3/8-inch NPT threading and features a 0.75-inch step diameter, making it ideal for custom fuel cells, tanks, and manifold installations in racing, automotive restoration, and industrial fluid management systems. The weld-on design ensures vibration-resistant integrity in high-performance and demanding environments where threaded connections alone may prove insufficient.

Constructed from aluminum in natural finish, this FRAGOLA fitting combines lightweight durability with corrosion resistance suitable for fuel and coolant applications. The 3/8 FPT (Female Pipe Thread) port accepts standard male NPT adapters, fittings, and gauges, while the welded interface creates a permanent, leak-proof seal that eliminates the risk of loosening under thermal cycling and vibration. The compact 1.4 x 0.85-inch flange and 0.75-inch step are optimized for flush-mount installations and tight fabrication spaces common in custom fuel system builds and engine bay modifications.

This weld bung is best suited for fabricators, performance shops, and enthusiasts building or modifying fuel systems, fuel cells, and fluid distribution networks where permanent, reliable port access is essential. Installation requires TIG or MIG welding to the fuel cell wall or manifold, making it ideal for custom tank construction and one-off system builds. The aluminum construction keeps weight to a minimum (0.02 lbs) while maintaining full NPT compatibility with aftermarket fuel pressure regulators, filters, and gauge senders used in street rods, race cars, and engine swaps.