We claim the design for a drop in sink, as shown and described.
FIG. 1 is an upper perspective view of the drop in sink, the dashed lines representing unclaimed features;
FIG. 2 is a top plan view thereof, with dashed lines representing unclaimed features, the bottom plan view being plain, unornamented and unclaimed;
FIG. 3 is a front plan view thereof, the rear plan view being plain, unornamented and unclaimed;
FIG. 4 is a right side plan view thereof, the left side plan view being a mirror image thereof; and,
FIG. 5 is a cross-sectional view of the interior thereof, taken in the direction of lines 5-5 of FIG. 2.
The broken lines represent unclaimed environmental features; the dash-dot-dot dash lines immediately adjacent shaded surfaces represent claim boundaries and form no part of the claim.