Cap Plug 12an (1pk)

The EARLS Cap Plug 12 AN is a precision aluminum fitting designed to seal AN port connections in high-pressure fluid systems. This black anodized cap plug is engineered for hydraulic, fuel, and pneumatic applications where reliable port closure and corrosion resistance are critical. Built to AN (Air Force-Navy) standards, it delivers the dependability demanded in aircraft, automotive, marine, and industrial equipment where system integrity cannot be compromised.

The 12 AN designation specifies the port size and thread specification for compatibility with standard AN fittings and manifolds. Constructed from aluminum and finished with black anodizing, the plug resists corrosion and oxidation while maintaining a lightweight profile essential in performance and aerospace applications. The anodized coating provides both aesthetic consistency with anodized system components and protective durability in harsh operating environments, including exposure to fuel vapors, hydraulic fluids, and temperature cycling. Single-unit packaging (1 pack) makes this ideal for repair, replacement, or system assembly work.

This fitting is essential for technicians and builders working with AN-specification hydraulic or fuel systems—whether assembling custom fuel systems, maintaining aircraft components, restoring vintage racing engines, or servicing industrial hydraulic equipment. When AN ports must be temporarily or permanently sealed during system assembly, testing, or operation, a quality cap plug prevents fluid leakage, contamination, and system failure. EARLS brand fittings are recognized throughout the racing, automotive, and aerospace industries for precision manufacturing and reliable performance under demanding conditions.