Just like a car, an air compressor requires regular maintenance to ensure proper operation and a long life. Apart from changing the oil, one of the most important things to remember to replace on an air compressor is the air filter, a small but vital component of any compressor. This replacement air filter is suitable for all Blackridge 'direct-drive' air compressors, along with a majority of direct drive air compressors from other leading manufacturers. This particular replacement air filter is designed with a small paper filter, and is designed to be replaced after every 50 hours of use, or more often in dustier conditions.