UpStart Battery 2-Pack Replacement Hoover WindTunnel Air Bagless Upright UH70400 Vacuum Primary Filter with 7-Piece Micro Vacuum Attachment Kit - Compatible Hoover Windtunnel 303903001 Primary Filter Replacement Hoover WindTunnel Air Bagless Upright UH70400 Vacuum Primary Filter plus 1 Micro Vacuum Attachmemt Kit Replaces Hoover Windtunnel 303903001 Primary Filter. The Micro Vacuum Attachment Kit includes a 35mm and 28mm connector for you vacuum. Please check your vacuum before buying to make sure it will fit. Vacuuming with a high-efficiency filter cleans the air inside your house. Ideal for those who suffer from dust-related or allergic discomforts. Removes dirt, dust and allergens while you vacuum to improve the air quality of your home. Don't let dust and dirt accumulate inside the vacuum then spreading it around your house. Lengthen the life of your vacuum cleaner plus improve the effectiveness and suction of your vacuum by installing a new filter with the same great quality as the name brand but at an affordable price. Overtime filters get clogged up with dirt impeding the airflow of the vacuum thus losing suction and performance. We recommend replacing your vacuum filters every 3 to 6 months for best performance . Made to neutralize odors at the source, releases clean, odor-free air into your home as you vacuum. Breathe easier and feel refreshed by filtering the air inside your household leading to overall better health. Note: Please check your vacuum to make sure you are purchasing the correct parts. On Sale for a Limited Time!