... Certificate:CE/GS/ROHS/SAA Characteristic:1.The unique in-air tube (bent pipe), incorporated with design dust bag, ... proof , alkali-proof ,anti-corrosion and more;4.Adopt professional Vacuum Cleaner’s motor , water absorption , oil-Absorbing ,acid suction, Dust ... is kept constant state;6.Four-layer filter system , Air Emissions 100% cleanly ; secondary pollution will not happened.Descriptions ...