It has two stage filter. The first stage is a water-oil separator, It works by the physical principles of gas reflux, Variable diameter cooling, vapor condensation. The second stage filter is an air filter, it with active carbon element inside, could absorbs moisture and odors from the air. The filter element need to be change after filling about 360L gas. Total about 95% of oil and water is separated by this filter, and the smell of the air is good. The filter equip with aviation grade aluminum alloy shell, resistance to high pressure. Compatible with many kinds of air compressors. You just need to pay attention to the connector. If not match, please prepare the adapter, Weight: 9.700339528 pounds, Manufacturer: Xiamen Subang Technology Co.,Ltd.