Those particular sockets were made by Winegard as part of their TV outlet panel. It is said (but I have not checked) that they are made to match a European standard. Why? Who knows? At any rate, I have never seen a non-Winegard outlet that is snug like this, so you needn't worry about accidentally buying one from another source.
Incidentally, my solution was to buy a one-outlet-to-two-outlet adapter, rub the body on a bar of soap to lubricate it, plug it into the Winegard outlet, and leave it there forever. Hey, you really need two of those 12-volt outlets, right?
Bill
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