After about 10 years, my previous vacuum wine stoppers recently gave up the ghost - one when the vacuum plunger stopped working and the other when the rubber seal tore. This set of two was so old I couldn't find a name on the units and I couldn't find anything on the inet that looked like them. So as much as I felt they had given good value, I could not order exact replacements. The Vinium wine stopper is similar in that, in contrast to many other approaches to the problem of degassing wine, it is a one piece unit, so I took a chance. However, after a couple of weeks trial, I am not thrilled with this purchase, for three reasons. First, the other reviews are correct, it takes a lot of work to even get a temporary vacuum. Second and more important, the vacuum doesn't hold nearly as well as the stoppers I had previously (my standard of comparison and goal for replacement). Previously I could count on the vacuum holding for 2-3 days at least, but that has not been my experience with the Vinium. Third, the Amazon web site refers to this product as a "set", and the main picture of the product shows two of these stoppers and a wine glass. So I think it is fair for me to have assumed that the product delivered would contain two stoppers. Wrong - one stopper, packaged in a nice little box. So what makes this a set? Stopper plus box? My dictionary says a set is "a number, group, or combination of things of similar nature". Does a single stopper plus its packaging qualify? Now granted, at the price I paid ($10) I wouldn't mind having received only one of these, if it worked well. But it doesn't.