I used 2 filters: EZ SPARES Replacement for Eureka DCF25 and EZ SPARES Replacement for Eureka EF-7 Vertical Vacuum Cleaner AirSpeed to replace the lost filter in the cylinder vacuum cleaner Eureka NEN110. It works great! Simply slide the white filter over the yellow foam filter and then place it in the NEN110 canister. ** Both filters are listed on the Revain page for this listing.