The Lexmark 40X8444 Separator Roll Assembly is a replacement printer part for paper-tray assemblies. Its exact part number identifies it as a separator roll assembly, and the Lexmark M1145 is listed as a compatible printer.
The parts catalog places 40X8444 in the option-tray assembly, alongside the pick roller assembly. This identifies its role as a component of the printer’s tray paper-feed assembly. Use the part reference 40X8444 when identifying this specific assembly for service or replacement.