Weld Bung 3/8in NPT Female - Aluminum

The Weld Bung 3/8in NPT Female - Aluminum from JOES RACING PRODUCTS is a precision-engineered fitting designed for custom fuel system and fluid line installations in high-performance and modified vehicles. This weld-on bung serves as a permanent mounting point for sensors, gauges, or fluid delivery systems where reliability and leak-free operation are non-negotiable. Built by racers for racers, it's an essential component for engine bay modifications, fuel cell integrations, and turbo system setups.

Constructed from lightweight aluminum with a natural finish, this bung features a female NPT (National Pipe Thread) 3/8-inch connection that accepts standard male NPT fittings for secure, threaded assembly. The weld-on design eliminates reliance on tank bosses or existing ports—you control placement, orientation, and integration points. NPT threading creates a tapered seal that tightens as the fitting is installed, providing excellent holding power even under vibration and thermal cycling common in modified engines. Aluminum construction keeps weight minimal while maintaining structural integrity in fuel and coolant applications.

This fitting is ideal for fabricators and enthusiasts building custom fuel systems, installing aftermarket boost controllers, or adding auxiliary oil cooler lines. Proper installation requires TIG or MIG welding to a compatible substrate—typically steel fuel tanks, catch cans, or custom aluminum reservoirs. The 3/8-inch NPT female port accommodates a broad range of aftermarket sensors, pressure transducers, fuel shut-off solenoids, and braided hose adapters. Verify material compatibility with your coolant or fuel type before installation, and allow adequate cooling time post-weld to prevent thread damage.