... High Precision Oil filter,can purify the dirty oil from pipes by itself automatically.Available type:6L,8L,10,20L,30L,40L. Oil filterOil ... purify Lubricating oil for oil-pressure machinery. It can remove impurities and moisture from the oil,to prevent the oil oxidizing and ... /min-40L/min;* An independent oil pump inside can continuously purify oil,and the filtration precision NASS to 7;* With alarm and ...