Designed to trap particles down to 1 micron while maintaining airflow, allowing you to reach full capacity without clogging or clumping. Part No.: 6.904-068.0, Festool / Festo 452065 452923. Vacuum cleaner filter compatible with Festool / Festo CT 11E, CT 22E, CT 33E, CT 33LE, CT 44E, CT 44 LE, CT 55E, CTL 11E , CTL 22E, CTL 33E, CTL 33LE, CTL 44E, CTL 44 LE, CTL 55E, CTM 11E, CTM 22E, CTM 33E, CTM 33LE, CTM 44E, CTM 44 LE, CTM 55E, CT Mini, CT11, CTL11, CTM11 , CT22, CTL22, CTM22, CT44, CTL44. Replacement lamella filter for A2001, 2000TE, 2000E, 3500, 3500E, 3501, 3501E, NT2000, NT2000E, NT3500, NT3500E, NT3501, NT3501E, K2000E , K2000TE, K3500E, K3501, NT351 Eco, NT14 / 1, NT351 Profi, NT351 Profi 14/1 Eco, NT 14/1 Eco Advanced, NT 14/1 Classic, NT 14/1 Eco Te Advanced, NT 351 HO, NT 351 Profi, NT 351 professional. Package included: 2 x filter.