Filler Cap Black with Weld-In Alum Bung Small

The Filler Cap Black with Weld-In Aluminum Bung Small from ALLSTAR PERFORMANCE is a precision-engineered fuel cell closure system designed for custom race cars, fabricated tanks, and aftermarket fuel system builds. This weld-on bung and threaded cap kit accommodates a 1.375-inch opening, making it ideal for builders working with compact or mid-sized fuel tanks where standard-size fillers won't fit. The black anodized aluminum construction provides corrosion resistance and a finished appearance suitable for visible engine bay installations.

The weld-in design means this bung is meant to be permanently installed into the tank wall via TIG or MIG welding, creating a structural bond that withstands fuel pressure and vibration inherent to motorsport environments. The aluminum threaded cap features a black anodized finish that resists UV fading and fuel degradation, ensuring smooth operation through multiple seasons of track use or street driving. The 1.375-inch opening size balances filler speed with compact packaging, making it a practical choice for tight engine compartments or custom fuel cell designs where larger fillers create packaging conflicts.

This kit is intended for fabricators, race teams, and performance builders who require a standalone filler solution rather than an integrated tank assembly. Whether building a custom fuel cell from sheet aluminum, installing an auxiliary tank, or fabricating a specialty fuel system, this bung-and-cap combination eliminates the need to source components separately. The small size specification indicates this kit is not suited for full-size truck tanks or large drum-style cells; instead, it addresses the growing market of custom-built, lightweight race cars and specialized automotive projects where precision and compact design are paramount.