Part number: 56P4102 Description: Duplex Option 500 Sheet T642 T644 (T642N, T644DTN T644N X646EF MFP)
Family: Laser Options
Lexmark T640, T642, T644 Series
Lexmark X642e, X644e, X646e MFP Series
Manufacturer: Lexmark
Not for T640. This fits 500 sheet units such as T642, T644, X642, X644 and X646

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