HP 5QJ90-40013 Guide-Duplex Upper is a printer paper-path guide for the duplex section. It is listed as a part for the HP LaserJet Managed Flow MFP E72535z, identifying its role and the printer family it serves.
The part is also listed for selected HP models, including the LaserJet Managed Flow MFP E72525Z Plus (Z8Z07A) and Color LaserJet Managed Flow MFP E77822–E77830Z (X3A64A). The same part number appears in listings for Samsung MultiXpress SL-X4300 and SL-X3280 series printers.
This component is intended for the upper guide position in the duplex paper path. The cited listings do not specify dimensions or package contents.