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 ago • purchased this product000purchased this productYou 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