AN Cap -4

The Allstar Performance AN Cap -4 is a precision aluminum fitting cap engineered for high-performance fluid systems in motorsports, racing, and industrial hydraulic applications. This black anodized 4 AN cap seals and protects critical pressure lines and ports, preventing fluid loss and contamination in demanding environments where reliability is non-negotiable.

Built from lightweight aluminum with black anodized finish, this AN cap resists corrosion and oxidation while maintaining low weight—critical in racing where every ounce matters. The 4 AN size (1/4-inch nominal bore) is a standard in fuel delivery systems, coolant lines, and brake fluid circuits. The anodized coating provides chemical resistance to fuels, oils, and hydraulic fluids while the compact 3.5 x 0.7 x 4.5-inch profile fits into tight engine bay configurations. Each cap is precision-manufactured to ensure leak-free sealing at operating pressures.

This cap serves racers, hot rod builders, and performance technicians who rely on AN-standard fluid systems. Whether capping off a fuel line during component changes, securing breather ports, or protecting open fittings during assembly, this 4 AN cap provides a clean, OEM-quality seal. The anodized finish resists the heat cycling and chemical exposure common in high-output engine bays and off-road environments.

AN fittings remain the standard across motorsports, aviation, and aerospace applications due to their proven pressure ratings and interchangeability. Allstar Performance is recognized for manufacturing OEM-quality hose and fitting components used by professional race teams and manufacturers worldwide. A single cap may seem minor, but a loose or missing fitting can cause system failure—this cap ensures integrity across your entire fluid system.