The HDC16-3 is a 3-cavity receptacle protective dust cap designed for HD10 series connectors manufactured by TE Connectivity/Deutsch Automotive. This protective cap provides an environmental seal to protect the connector interface when the connector is not mated, preventing contamination and moisture ingress. The cap is compatible with 3-cavity HD10 series receptacle connectors and is available in standard gray color, with optional black finish (E004 modification). The HDC16-3 is commonly used in industrial and commercial transportation applications where connectors require protection during storage, transport, or when disconnected from service. It can be assembled with optional lanyards (nitrile or steel cable) for secure attachment and prevention of loss.