FilterBuy 4 Hoover Foldaway and WidePath Filters. Designed by to Replace Hoover Part # 40130050. 4 HEPA Replacement Filters for Hoover Foldaway and Widepath Vacuum Cleaners Designed by FilterBuy to replace Hoover Part # 40130050 Premium Allergen Filter Designed by FilterBuy to fit all Hoover Fold Away models in the 51000 series and Turbo Power 3100. For optimal performance, replace every 3 - 6 months FilterBuy: Breathe Better!