4 - Hoover WindTunnel Secondary Filters. Designed by FilterBuy to fit Hoover Tempo Widepath and Fold Away Vacuum Cleaners. Replaces Hoover parts 38765-019, 38765019, 38765023, and 38765-023. Pack of 4 Hoover Windtunnel Secondary Allergen Replacement Vacuum Filters. Designed by FilterBuy to fit Hoover Tempo Widepath and Fold Away Vacuum Cleaners. Replaces the following Hoover part #'s: 38765-019, 38765019, 38765023, and 38765-023. Vacuum FilterBuy: Breathe Better!