The ornamental design for a funnel, as shown and described.
FIG. 1 is a top perspective view of the funnel showing the new design;
FIG. 2 is a bottom perspective view of the design shown in FIG. 1;
FIG. 3 is a bottom view of the design shown in FIG. 1;
FIG. 4 is a top view of the design shown in FIG. 1;
FIG. 5 is a side view of the design shown in FIG. 1;
FIG. 6 is a cross-sectional side view of the design shown in FIG. 1 taken along dash-dot-dash line 6-6 in FIG. 3; and,
FIG. 7 is a side perspective view of the funnel showing an example use position.
The dash-dot-dash line of FIG. 3 is to show the plane upon which the sectional view of FIG. 6 is taken, and forms no part of the claimed design. The broken lines of FIG. 7 are for environmental purposes only and form no part of the claimed design.