These printers use the 810-4 cartridge:
PitneyBowes-Imagistics 9800
PitneyBowes-Imagistics 9800 Series 0
PitneyBowes-Imagistics 9820
PitneyBowes-Imagistics 9830
PitneyBowes-Imagistics 9850
Imagistics 9820
Imagistics 9830
PitneyBowes 9820
PitneyBowes 9830