The ornamental design for a shoulderportion of a sprayer tank and cap, as shown and described.
FIG. 1 is a front view of my design for the shoulder portion of a sprayer tank and cap, showing my design, the view also showing in broken lines an environment for the invention, namely the bottom portion of the tank, the pump handle, and the sprayer wand and hose attached to the tank which are shown for illustrative purposes only and are not part of the invention;
FIG. 2 is a perspective view from the top thereof of the cap of my design;
FIG. 3 is a rear view of the shoulder portion of a sprayer tank and cap in accordance with my design; and,