Winners we picked who had the correct answer are ----

There were A LOTof correct answers. We picked six at random that included the word Champagne, since that's what it's sold as, a champagne bottle stopper. Yes Chad showed this on the Giz Wiz years ago, but I hoped people didn't recognize it from the bottom! And they're very inexpensive! Here's 5 for $10 on Amazon: https://amzn.to/2s6t6lT 

Our 6 winners, picked from dozens at random:

The gadget looks like one of my favorite gadgets that Chad had on the show a couple of years ago. It is a champagne bottle stopper. Brandon Hanke

Looks like a champagne/sparkling wine/liquor bottle cap stopper saver/ sealer. Scotto

A bubble keeperinerer for Champagne, clips over the neck of the bottle. Kayhe9 (not in US)

It's a champagne stopper, to re-cork your bubbly between soirees. The hinged stopper latches onto the bottle below the annulus (that's what it's called). Ralph Osinski

Definitely know it’s a champagne bottle stopper. SaxmanJoe

It's a stopper for champagne bottles. You put the stopper on top and the two wings attach to the ring around neck. Kotsker

Winners above, see how to claim your MAD below the Cute, Silly, Could Be answers.