Brother ASF Roller Core Ass BHM13 (LEL245001) is a paper pull-in roller part for compatible Brother MFC printers. It is identified in the parts documentation as a T1 or T2 paper pull-in roller, depending on the printer configuration, and is used in the printer’s paper feed path.
The listed compatible models include MFC-J3720. The part is also listed for MFC-J5720DW and MFC-J5320DW, and the manual identifies it for the T2 position in MFC-J6720DW and MFC-J6920DW configurations.