InkOwl Replacement Plug for BROTHER TN-720, TN-750, TN-780 This plug is highly recommended if you plan on refilling your TN-720, TN-750, or TN-780 cartridge many times. Printer models: DCP-8110DN, DCP-8150DN, DCP-8155DN, DCP-8250DN, HL-5440D, HL-5450DN, HL-5450DNT, HL-5450DW, HL-5470DWT, HL-6180DW, HL-6180DWT, MFC-8510DN, MFC-8520DN, MFC-8710DW, MFC-8910DW, MFC-8950DW, MFC-8950DWT