3M Filtrete Hoover Self-Propelled WindTunnel (Style 170) Vacuum Belt Nullify Imported Fits vacuum models Hoover* Self-Propelled WindTunnel* Bagged and Bagless Models, including Anniversay WindTunnel*, WindTunnel*, Mach* Cyclonic* and units taking the 40201170 and 38528035 belts. Maintain optimum vacuum performance by replacing your belt every 12 months. All vacuum brand and model names are registered trademarks of vacuum manufacturers.