The DocuMate 4440 has two different cleaning and maintenance kits. Depending on the scanner version you have, the paper separation technology will be either an ADF Pad or a Separation Roller. Please check the part number on the data plate, located on the back or underside of the scanner, to determine which version of the scanner you have.
If your scanner's part number is 85-0289-000 or 85-0289-100, your scanner uses ADF Pad. Order DM4440 Maintenance Kit V.1
If your scanner's part number is 85-0311-000 or higher, your scanner uses Separation Roller. Order DM4440 Maintenance Kit V.2