Designed to fit thesee vacuum models and more: 4420, EC03PU2, EC12SWC, EC12SX2, EC12SX3, EC12SX6, EC12SXT2, EC12SXT4, EC12SXT4B, EC12SXT5, EC12TBC, EC-4320, EC12, EC12SWC, EC12SXT5, EC-12SXT5, EC-12SXT5, EC12TBC, EC-12TBC, EC12TWC, EC-12TWC, EC12TWT4, EC12TWT4, EC-12TWT4, EC12TWT6, EC-12TWT6, EC12TXT2, EC14, EC-14TX6, ECS2720, ECT2640, EC-T2640, ECT2650, EC-T2650, ECT2840, ECT2850, ECT2860, ECT2860, EC-T2860, ECT4650, ECT5965, ECT5970, ECT5980, ECT5980, EC-T5980, ECTU2607, EC-TU2607, ECTU2609, EC-TU2609, ECTU2807, EC-TU2807, ECTU2809, EC-TU2809, ECTU4607, EC-TU4607, ECTU4609, EC-TU4609, ECTU4707, EC-TU4707, ECTU4709, EC-TU4709, ECTU4810, EC-TU4810, ECTU4840, EC-TU4840, ECTU590, ECTU5907, EC-TU5907, ECTU5909, ECTU5909, EC-TU5909, ECTU5910, ECTU5910, EC-TU5910. Traps and seals in 99. 7% of dust mites, pollens, ragweed, mold spurs, microscopic particles, bacteria, germs as small as 0. 1 micron, other allergy causing agents, and 99. 9% of pet dander. A must for allergy sufferers!