FT BLK METAL CAT5e RJ45 M3 - Cliff CP30296, The Cliff CP30296 is a black USB 3.
0 type B dust cover designed to fit feedthrough connectors.
They simply push in to the front of the USB type B port to reduce the ingress of dust and dirt.
One cover supplied only.
Cliff CP30296 Black dust cover for USB3-B connectors