Check the listing for details. Rainbow Genuine HEPA Filter (Neutralizer) for 1st Version E-2 (e SERIES™). Color: White, Condition: New. Listed at 35.75 USD. An original filter will have the TRADEMARK e SERIES logo molded on the round cross section. Original OEM factory True H13 class HEPA filter (Neutralizer) for the single speed E-2 (e SERIES™) Rainbow unit. If you did not have to remove 4 screws to replace your filter, this is the WRONG PART! Effective serial number 9000000 with a start date of August 5th 1998 through serial number 9279999 and an end date of March 26th 2000. Previous markings on some early versions may show R7285. The bulk item number for this is R12107B. Some websites list this part number for a single item which is incorrect. Another way to confirm that this is the correct filter is that on some rear cover assemblies, there may be manufacture markings stamped on the inside that include R-7319-x.