-3 Aluminum Caps 20pk

The ALLSTAR PERFORMANCE -3 Aluminum Caps 20-pack (SKU ALL 50821) is a set of protective dust caps designed for AN-3 fluid and pneumatic fittings commonly found in automotive, marine, and aerospace applications. These aluminum caps seal unused ports and connections to prevent contamination from dirt, moisture, and debris—critical when working with hydraulic systems, fuel lines, or pressurized air circuits where internal cleanliness directly impacts system reliability and safety.

Each cap in this 20-pack features a natural aluminum construction that resists corrosion under typical shop and field conditions. The -3 designation matches the AN JIC fitting standard, ensuring proper fit on all AN-3 ports without threading damage or air leaks. Because these caps are consumable items—easily lost, misplaced, or damaged during assembly and disassembly cycles—purchasing a full 20-pack ensures adequate stock for multiple projects or frequent maintenance schedules without repeated reordering.

Technicians and builders working on custom fuel systems, intercooler setups, cooling circuits, and pneumatic tool networks rely on these caps to maintain port integrity between assembly stages. The compact design and lightweight aluminum (0.05 lbs per pack) make storage practical in tool boxes or on the workbench. Whether you're protecting ports during engine bay modifications, marine engine rebuilds, or compressed air system installations, having a reliable supply of replacement caps minimizes downtime and prevents costly contamination-related failures.