Black Alum Fill Cap w/ Alum. Weld Bung 2in

The Black Alum Fill Cap with Aluminum Weld Bung 2in from VIBRANT PERFORMANCE is a precision engineered tank closure system designed for custom fluid reservoirs, radiators, and pressurized containment applications in performance automotive and industrial environments. This weld-on bung and threaded cap kit provides a sealed, professional-grade solution for engineers and fabricators who demand reliability in high-temperature and high-pressure scenarios.

The 2-inch opening accommodates standard filler hose diameters while the aluminum construction delivers lightweight durability with corrosion resistance. The weld-on bung design creates a permanent, pressure-tight integration into tank walls, eliminating weak threaded joints common in lower-cost alternatives. The black anodized aluminum threaded cap seals the opening and can be removed for maintenance access. This kit combines the structural integrity of welded aluminum with the convenience of a quick-access cap system, making it suitable for street rods, race cars, custom cooling systems, and aftermarket reservoirs where both form and function matter.

Fabricators and performance builders select this bung and cap kit when OEM filler necks are absent or non-functional. The aluminum-to-aluminum construction ensures coefficient of thermal expansion compatibility, reducing the risk of seizing or leakage across wide temperature ranges. This 2-inch bung and cap assembly fits standard radiator hose sizing and is frequently paired with custom-built cooling systems, overflow tanks, and fuel cell configurations. Whether you're building a vintage hot rod, a modern race platform, or restoring high-performance machinery, this weld-on closure system provides the engineering-grade reliability expected from VIBRANT PERFORMANCE products.