Everything is in the title oupresque: Twinning with the vacuum device is simple and fast. The vacuum obtained satisfactory: it allows for example to store wine or oil without their turn. The caps seem to fit any more or less standard necks (relatives bottle of wine). To open: turn and shoot!
Their only flaw: the price (15 to purchase) excessive considering the simplicity of the accessory. The Q / P is well underway for this reason I remove 2 stars.