The ornamental design for a sink, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a perspective view of the sink of the present invention.
FIG. 2 is a front elevation of the sink of the present invention.
FIG. 3 is a rear elevation of the sink of the present invention.
FIG. 4 is a right side elevation of the sink of the present invention.
FIG. 5 is a left side elevation of the sink of the present invention.
FIG. 6 is a top view of the sink of the present invention; and,
FIG. 7 is a bottom view of the sink of the present invention.