Filler Cap with Weld-In Bung Alum 2in ID Black

The Filler Cap with Weld-In Bung Aluminum 2in ID Black by JOES Racing Products is a purpose-built fuel system component designed for custom fabrication and performance vehicle builds. Whether you're working on a fuel cell installation, dry sump conversion, or custom tank setup, this weld-in bung provides a secure, integrated mounting point for a filler cap without relying on threaded inserts or clamps. This product is essential for builders and mechanics who demand clean, professional-grade results on high-end race cars, show vehicles, and modified street cars where reliability and aesthetics matter equally.

This aluminum weld-in bung features a 2-inch inner diameter opening that accepts standard 2-inch filler caps, making it compatible with most aftermarket fuel system configurations. The weld-in design eliminates the need for threaded bosses or welded tabs by providing a complete assembly that integrates directly into your tank or reservoir during fabrication. Constructed from lightweight aluminum alloy, it resists corrosion and fuel degradation while maintaining structural integrity under pressure cycling. The black powder-coat finish protects against oxidation and presents a finished, OEM-quality appearance in engine bays and fuel cell compartments.

Mechanics and fabricators building fuel cells, dry sump systems, or custom tanks will appreciate the engineering simplicity and installation flexibility this bung delivers. Its compact footprint (4.05 x 1.75 x 5.25 inches) and minimal weight (0.2 lbs) make it ideal for weight-conscious performance builds without sacrificing durability. Installation requires welding the bung boss directly to your tank wall or fuel cell container; this permanent integration ensures zero vibration-induced looseness and eliminates potential fuel leaks at connection points. JOES Racing Products' reputation in circle-track and performance racing ensures this component meets or exceeds the demands of competitive and street-driven vehicles alike.