Festool 452923 Main Filter Element For CT 22 And CT 33, 2 Pieces Standard 1 micron paper replacement filter Designed to trap particles down to 1 micron while maintaining airflow, allowing you to reach full capacity without clogging or caking Includes 2 Standard Main Filter Elements for the CT 22 and CT 33 Made in Germany Includes 2 filter elements. Made in Germany.