The ornamental design for a countertopdispensingunit, as shown and described.
FIG. 1 is a perspective view of a countertop dispensing unit.
FIG. 2 is a front view of a countertop dispensing unit.
FIG. 3 is a back view of a countertop dispensing unit.
FIG. 4 is a right side view of a countertop dispensing unit.
FIG. 5 is a left side of a countertop dispensing unit.
FIG. 6 is a top view of a countertop dispensing unit.
FIG. 7 is a bottom view of a countertop dispensing unit; and,
FIG. 8 is an environmental perspective view thereof.
The broken lines showing the bag support vessel used in conjunction with the countertop dispensing unit are for illustrative purposes only and form no part of the invention.