Model SZS020 SZS050 SZS080 Pumping capacity(m3/h) 20 50 80 Ultimate pressure(Pa) 3(50) Dry compound screw vacuum pump is ideal for any application where oil contamination is unacceptable and for corrosive field. Dry screw vacuum pump widely used in the fields of medical instruments, analysis instruments, biological products and pharmaceutical preparation, food and medicine packaging, gasoline vapor recycle, film preparation, high science engineering and chemical analysis, semiconductor, micro-electronics, solar energy, deal with materials industrial and R&D labs etc.