#8 Cap

The #8 Cap from EARLS is a precision-engineered aluminum fitting cap designed for high-performance fluid systems in automotive, motorsport, and industrial applications. This compact yet critical component serves as a protective end cap for 8 AN (American National) port connections, preventing fluid loss, contamination, and oxidation when lines are disconnected or capped off. Whether you're building a custom cooling system, fuel line assembly, or hydraulic circuit, the #8 Cap ensures clean, secure termination of your fluid pathways.

Manufactured from lightweight aluminum and finished with a vibrant blue anodized coating, this fitting cap combines durability with corrosion resistance. The anodized layer not only protects the aluminum base from oxidation and chemical attack but also provides a professional appearance that matches modern racing and custom build aesthetics. The 8 AN thread size is the industry standard for mid-flow applications, making this cap compatible with a wide range of aftermarket hose assemblies, adapters, and manifolds. Weighing just 0.04 lbs, it adds negligible mass to your system while delivering reliable sealing and protection.

This cap is essential for anyone working with AN-sized fluid systems—drag racers, engine builders, transmission specialists, and fabricators regularly stock multiple units to cap off test ports, overflow lines, and temporary connections. Installation is straightforward: simply thread the cap onto the 8 AN male port by hand or with a wrench, tightening firmly but without over-torquing to avoid stripping the aluminum. The compact 1.2 x 1.15 x 1.5-inch footprint fits tight engine bays and cramped mounting areas where space is at a premium. Compatible with all standard 8 AN fittings and hose end adapters, the #8 Cap is an indispensable consumable for system assembly, maintenance, and storage.