Roots Pump Vacuum System Wuhan GIENS Pump Co., Limited As a division of Wuhan GIENS Industry Co., Ltd, GNS PUPM is specialized in design and production of Vacuum Pump and Centrifugal Pump. Our pumps can be well used for coal mining industry, paper-making, sugar, pharmaceutical industry, chemical industry, oil refining, atomic and nuclear reactors, space physics experiment, the aircraft parts...