The AC series air filter assembly (triple set) is designed to remove excessive moisture and oil droplets, as well as solid impurities such as rust, sand particles, and pipeline sealants from compressed air at the source. These can damage piston seals, block small exhaust holes on components, shorten the lifespan, or render them inoperable. The function of the air filter is to separate liquid water and oil droplets from the compressed air and filter out dust and solid impurities from the air, but it cannot remove gaseous water and oil.