Standard filtration with sure-seal gasket bag collar for leakage protection. Designed to fit Facet MFC-523 upright. Also fits Riccar 2000, 4000 series uprights, Simplicity 5000, 6000 series uprights, most Fuller Bag uprights, most Carpet Pro upright models, most CleanMax upright models, most Panasonic uprights that take Style U, U3, and U6 bags, as well as most Kenmore upright models that takeType U 50688, and Type O Bags.