xy100t replacement air400 filter for bissell air400 air cleaner purifier, 1 pack 2521 true hepa filters, 6 pack pre-filters, 1 pack 2520 active carbon filters, compared to part 2521, 2520 1 hepa + 1 carbon filter + 6 pre-filters is up for auction in Appliances. This item is in New/Like New condition. Bid on this item at our Vandalia - Industrial Park Drive location before the auction closes.