Hoover Windtunnel T-Series Rewind Upright Vacuum Cartridge HEPA Filter, Item Replaces Hoover Part # 303172001, 303172002 by ZVac 1 Hoover Windtunnel T-Series and Rewind Cartridge Filter by ZVac Similar to Part # 303172001, 303172002 and All Hoover Windtunnel T-series models and Rewind T Series beginning with UH701, or UH702 series part numbers Absolutely Essential for all Allergy Sufferers