These printers use the TYPE 461-3 cartridge:
PitneyBowes-Imagistics DL 460
PitneyBowes-Imagistics DL 550
PitneyBowes-Imagistics IM 4720
PitneyBowes-Imagistics IM 5520
Imagistics DL 460
Imagistics DL 550
Imagistics IM 4720
Imagistics IM 5520