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That is the first thing I noticed in the original post. Why did it take until comment #21 to notice that it's the wrong plug adapter?
And I don't think I saw it explained very clearly yet about the P and R terminology.
At your house, the things in the wall are called "receptacles", so that's why you see 10-30R. The cord from a lamp or microwave or dryer has the metal pins on it and is called the "plug", so that is why you see 10-30P. It's to tell whether you are buying a plug piece or a receptacle piece.
Oh, I just figured that out. It's Ebay being weird and doing an automatic redirect. It says, "That listing has ended. Here is something similar." and it's going to a listing for a 6-15 plug.
Sorry for the confusion guys. Yes, the ebay listing was ended by me so I guess it was redirecting to different item. I did purchase the 10-30 adapter though.