The ornamental design for a double bowl reversiblesink, as shown and described.
FIG. 1 is a front perspective view of a new double bowl sink showing a façade design at a first side of the double bowl sink;
FIG. 2 is a front view of the double bowl sink showing the façade design at the first side;
FIG. 3 is a back view of the double bowl sink showing a façade design at a second side;
FIG. 4 is a side view of the double bowl sink showing a façade design that is the same on both opposing sides; and,
FIG. 5 is a top view of the double bowl sink.
The broken line portions of the sink represent the bounds of the claimed design and form no part of the claimed design. The bottom of the sink is flat and devoid of surface ornamentation and forms no part of the claimed design.