Device which welds but is not a vacuum, so it is useless! I phoned Krups but was told that this is normal, its primary function is to weld not to remove the air. They told me verbatim that its function was to extract the air not to empty, I have to say what that extracting meant removing and mine did not remove the air, nothing to do c It is "normal" ....... I find that a star is still much !!!