We claim the ornamental design for a dual flush handle, as shown and described.
FIG. 1 is a perspective view of an embodiment of the claimed design;
FIG. 2 is a front view of the design of FIG. 1;
FIG. 3 is a rear view of the design of FIG. 1;
FIG. 4 is a left-side view of the design of FIG. 1;
FIG. 5 is a right-side view of the design of FIG. 1;
FIG. 6 is a top view of the design of FIG. 1;
FIG. 7 is a bottom view of the design of FIG. 1;
FIG. 8 is a perspective view of another embodiment of the claimed design;
FIG. 9 is a front view of the design of FIG. 8;
FIG. 10 is a rear view of the design of FIG. 8;
FIG. 11 is a left-side view of the design of FIG. 8;
FIG. 12 is a right-side view of the design of FIG. 8;
FIG. 13 is a top view of the design of FIG. 8; and,
FIG. 14 is a bottom view of the design of FIG. 8.
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 portions of the design. Broken lines formed of unequal length dashes (i.e., dash-dot) show boundaries between claimed and unclaimed portions of the design.