Silver Cap Small

The Silver Cap Small by ALLSTAR PERFORMANCE is a universal screw-in filler cap designed for fuel tanks, coolant reservoirs, and other fluid containment systems where a 1.375-inch outer diameter opening exists. This compact aluminum cap serves both functional and aesthetic purposes—sealing critical fluid access points while maintaining a clean, professional appearance with its silver anodized finish. Engine builders, restoration specialists, and performance enthusiasts rely on quality filler caps to prevent fluid loss, contamination, and pressure buildup in pressurized systems.

Constructed from lightweight aluminum and finished with silver anodizing, the Silver Cap Small provides corrosion resistance and durability in high-vibration engine compartment environments. The screw-in design ensures a secure, leak-free seal without requiring additional hardware or tools—simply thread it into the matching opening until snug. The 1.375-inch outer diameter specification is the industry standard for many fuel tanks and radiator systems, making this cap a versatile replacement or upgrade component. Aluminum construction minimizes weight while the anodized surface prevents oxidation and maintains appearance over years of service.

Mechanics and engine builders benefit most from this universal cap when restoring classic vehicles, upgrading cooling systems, or servicing fuel delivery assemblies. Installation is straightforward—remove the old cap and thread the Silver Cap Small into place, ensuring it seats properly to maintain system pressure and prevent vapor escape. The modest 0.26-pound weight and compact 4 x 1.4 x 7-inch dimensions make it easy to stock and install in tight engine bay configurations. Whether you're building a street rod, maintaining a daily driver, or repairing fleet equipment, this ALLSTAR PERFORMANCE cap delivers the reliability and clean appearance that professional shops expect.