uxcell Ethernet Hub Port RJ45 Cover Cap Protector Connector 10Pcs Black

They do exactly what you want them to. Made of soft rubber and fit in port well. No excessive overhang, so you can put them in a switch and they dont interfere with surrounding ports.

These things are great. Snug fit, easy to remove, and get the job done. Best plug/dust covers I have ever found.

Covers the ports well.

These represent an excellent solution for a very small problem. The rubber dust covers fit snugly into ethernet ports and Im quite comfortable they serve their purpose well (in this case protecting a switch installed into my garage workshop serving networked devices and some ethernet jacks connected through my attic). A tab allows for easy removal.

I needed a way to block staff at the office from plugging into disconnected ports. These did the trick - no more complaints!

Great product!

Took a while to get them (shipped from China), but very satisfied with the product.

Worked great, product was exactly as described.

They plug the hole.

Bought 30, all fit perfectly. Would recommend them.