HP B3Q11-40001 control panel mount base is a replacement part for mounting a printer’s control panel. The product page identifies it as the CP Mount Base 3.0 and associates the exact part number with HP Inc.
It is listed for the HP LaserJet Pro MFP M426fdn and M426fdw. This base serves as the mounting component for the control panel in those printer models. The listing confirms the part’s identity and intended use; it does not specify dimensions, materials or package contents.