Filler Cap Red with Weld-In Alum Bung Small

The Allstar Performance Filler Cap Red with Weld-In Aluminum Bung Small (ALL36165) is a precision-engineered fuel cell closure system designed for high-performance racing applications. This weld-on bung and cap assembly features a 1.375-inch opening diameter and combines an aluminum weld-on bung with an aluminum threaded cap finished in red anodizing for corrosion resistance and visual identification.

The aluminum threaded cap design allows quick access for fueling while the weld-on bung construction provides permanent structural integrity once installed. The red anodized finish not only offers protection against oxidation and moisture intrusion—critical in racing environments where fuel tanks experience thermal cycling and exposure to ethanol-blended fuels—but also serves as a color-coded safety marker for fuel system identification. The small form factor (4.85 x 1.3 x 6.9 inches, 0.31 lbs) integrates cleanly into compact fuel cell designs without adding unnecessary bulk or weight to the vehicle.

This assembly is commonly used in circle track racing, drag racing, autocross, and off-road competition where fuel cells are mandated by safety regulations. Builders and fabricators choose this Allstar bung-and-cap kit for fuel cells requiring the 1.375-inch opening size as it delivers reliable threaded access without the need for additional sealing compounds. The aluminum construction keeps overall fuel cell weight minimal while maintaining adequate durability for sustained racing duty. Installation requires welding the aluminum bung to the fuel cell itself, making this a permanent, race-grade solution suitable for both amateur and professional motorsports applications.