tamara.hugi7 years ago-101Good day Is it possible to use only one pump? or does the device only work if you always use both pumps?Show in original language (German)Kristina.rust7 years ago000You can also use only one pump. You can plug the hose that you do not need into the T-piece of the hose set. This creates a vacuum for the one pump.Show in original language (German)Comment