I tested with a plug that came with my machine: Although the notice is stingy in instructions, the implementation is simple and intuitive. We put the cap with the "fine" upside down, is pressed (if it does not work, your neck is too small, do not insist and change your bottle!), Plug the hose provided to the small hole at the top the cap, the pipe is connected to the machine (specific location), and launching a conventional vacuum setting. It's very effective, for against, to remove the cap, I do not know how it's done ... I dare not pull too hard for fear of breaking it!