Hoover Windtunnel 2 Filter Set 303172001 & 304087001 Go to amazon.com Related posts List of the Top 6 hover filter 43613-021a you can buy in 2024 Feature(1) 303172001 HEPA Filter(1) 304087001 Secondary Filter DescriptionHoover WindTunnel Max Multi-Cyclonic Filter Set Model UH70600, UH70607, UH70608, UH70700, UH70603, UH70604, UH70602, UH70607, UH70608, UH70700.