Pre-arrangement feature for self-operation?Rational refining management - Adoption of pressure control valve?Maximum efficiency of oil filtration by the detection of element-changing time. - Easy cleaning and changing in short time by using the open-type suction strainer - Adoption of dustproof gauge?Verification of contamination status & exact element-changing time by accurate pressure - Adoption of dry valve?Oil transfer feature - Efficient use by the record of refining time - Custom-made oil cleaner possible upon