Wines By The Glass 5 Wine Preservation Options for Restaurants and Bars In this issue of Restaurant Update Magazine, we take a look at a handful of options available for restaurants and bars to keep their wines fresher for longer when serving wines by the glass: 1. Handheld Vacuum Pumps One of the oldest wine preservation gadgets, the handheld “vacuum” pump, has been a staple in many kitchen drawers since 1986 and can still be found in some restaurants and bars to this day.