There is no oil in the water-lubricated screw body, which will not cause oil pollution of the compressed air. It belongs to a completely oil-free screw air compressor. Dry-type oil-free machine bearings, gearboxes, and intercoolers require oil to participate in lubrication and sealing. The high temperature of the unit can easily cause oil leakage to pollute the compressed air. It is a semi-oil-free compressor.