I claim the ornamental design for decorative ends for ribs on a tank container, as shown and described.
FIG. 1 is a perspective view of a pair of decorative ends for ribs on a tank container according to a first embodiment of the present invention;
FIG. 2 is an enlarged view of the pair of decorative ends of FIG. 1;
FIG. 3 is a perspective view of pairs of decorative ends for ribs on a tank container according to the second embodiment of the present invention; and,
FIG. 4 is an enlarged view of one pair of ribs of FIG. 3.
All portions shows in broken lines are environmental and illustrative only and form no part of the claimed design.