The ornamental design for a funnel, as shown and described.
FIG. 1 is a top plan view of a funnel, wherein the broken line which defines the bounds of the claimed design forms not part thereof.
FIG. 2 is a front elevation view of the funnel of FIG. 1, wherein the broken line which defines the bounds of the claimed design forms no part thereof.
FIG. 3 is a left elevation view of the funnel of FIG. 1, wherein the broken line which defines the bounds of the claimed design forms no part thereof.
FIG. 4 is a rear elevation view of the funnel of FIG. 1, wherein the broken line which defines the bounds of the claimed design forms no part thereof.
FIG. 5 is a right elevation view of the funnel of FIG. 1, wherein the broken line which defines the bounds of the claimed design forms no part thereof; and,
FIG. 6 is a bottom plan view of the funnel of FIG. 1, wherein the broken line which defines the bounds of the claimed design forms not part thereof.