FIG. 1 is a perspective view of a sewage tank in accordance with the new design;
FIG. 2 is a front elevational view thereof; a rear elevational view being a mirror image thereof; and,
FIG. 3 is a right side elevational view thereof, a left side elevational view being a mirror image thereof.
The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.