A wall smooth, reliable strength of special rubber hose inside the pump installation, by rotating the squeezing roller along the hose is a pair of such rotation makes medium to one direction, and there won't be back.Flattened hose under their own flexibility and side guide roller forced restorable. At this point, the tube materials materials will produce high vacuum suction cavity, and then, the material in the subsequent roller pressure escape from the hose.So the cycle, material overtaken by suction and discharge.