UpStart Battery 2-Pack Replacement Eureka EF-91B Vacuum Dust Cup Filter - Compatible Eureka DCF-21 Filter Replacement Eureka EF-91B Dust Cup Filter; Quantity, 2 Replaces Eureka DCF-21 Filter 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!