Barrel connector size for USB2-HUB4BC?

I have the USB2-HUB4BC and purchased an adaptaplug C connector from Radio Shack based on this answer:…

…seen for sale here on Amazon:

When I got it home, I discovered it did not fit. Can you confirm the barrel connector size again? I’d ideally like to order something from Amazon or another online retailer since getting to the store is difficult for me, so knowing the size, by name, is crucial. Thanks in advance.