Reservoir Tank

FIG. 1 is a front perspective view of a reservoir tank according to one embodiment of our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a first side elevation view thereof;

FIG. 5 is a second side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The evenly dashed lines in the figures depict environmental features and portions of the article(s) that form no part of the claimed design. The unevenly dashed lines define a boundary of the claimed design, and the unevenly dashed lines form no part of the claimed design.