The listing, Lavatory Pop-Up Plunger has ended.
This is an ace sink stopper. It does not have the hook on the bottom that attaches it to some sinks. The package says "fits most popular brand products", but it didn't fit mine. This is NIP and was only opened to see if it fit the sink. The picture ins't great - it should show the silver top, but I'm not the best picture taker. The silver plug is about 1 1/8 inches round. The package has directions for installation.