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Title: Hoffritz Wine Saver usability
Review: I'm delighted with the functionality of this product. While doing an excellent job in bottles with openings that correspond to the stopper's measurements it is, however, too narrow for bottles with larger openings. A major shortcoming I found is that the black plastic material on the top of the stopper tends to break when closing the lock. Without the top material, the expansion effect of the stopper is decreased and becomes unsusable. Of the four stoppers I purchased, only one is still unbroken.
