... air compressor:1.oil free ,low cost No need for air compressor oil , free maintenance, only one ... industrial air compressor the same simple,no need professional care10.Units are air-cooled type, ... meters, with 7 workshops and 6 production line for different process. The workshops, has seperates to painting ... detergent .Change the quleter filter after 500 hours working time . 2.change the compressor in the ...