Working principle: piston compressor. 2055-1.5KW-2HP air compressor head. 2055-1.5KW-2HP air compressor head + silencer + screw + breathing nozzle. Transparent oil level display, open the oil filler plug, add enough lubricating oil to the specified specifications of the machine, and the oil level to 1/2-2/3 of the oil mark.