We claim the ornamental design for a sink leg, as shown and described.
FIG. 1 is a top, front, left perspective view of an embodiment of the claimed design;
FIG. 2 is a front elevation view thereof, the rear elevation view being a mirror of the front elevation view;
FIG. 3 is a left side elevation view thereof, the right side elevation view being a mirror of the left side elevation view;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. Broken lines formed by equal length dashes show unclaimed subject matter. Broken lines formed by unequal length dashes (i.e., dash-dot) define bounds of the claimed design.