CA2209-5101 is an externally threaded metal protective dust cap designed to protect MS3106 and MS3108 plugs in MIL-DTL-5015 connector applications. The cap is manufactured from aluminum alloy and is available with black anodized finish with sash chain or olive drab chromate over cadmium finish without sash chain. For the 10S and 10L shell sizes, this cap features a maximum body diameter of 0.815 inches (20.70 mm), a maximum cap diameter of 4.500 inches (114.30 mm), and a 5/8-24UNEF-2B thread specification. The dust cap is commonly used in aerospace, military, and industrial connector applications where protection from contamination and environmental exposure is critical, ensuring connector integrity and reliability during storage and transport.