Genuine OEM Panasonic UF-4000 Toners

For the Panasonic UF-4000, UG3221 identifies black toner and UG3220 identifies a black drum unit. Their numbers differ at the last digit, so the full code and supply name distinguish these separate items.

Toner Buzz lists genuine Panasonic UG3221 toner and UG3220 drum units for the UF-4000. Check whether the product is toner or a drum before comparing its black color label.