The ornamental design for a funnel, as shown and described.
FIG. 1 is a top-front perspective view of a funnel showing my new design;
FIG. 2 is a left side elevational view of the funnel of FIG. 1;
FIG. 3 is a right side elevational view of the funnel of FIG. 1;
FIG. 4 is a top plan view of the funnel of FIG. 1;
FIG. 5 is a bottom plan view of the funnel of FIG. 1;
FIG. 6 is a bottom-rear perspective view of the funnel of FIG. 1;
FIG. 7 is an enlarged side view of the spout portion of the funnel of FIG. 1, wherein the stepped protrusions disposed on the external surface of the spout portion are illustrated in detail; and,
FIG. 8 is an enlarged bottom perspective view of the spout portion of the funnel of FIG. 1, wherein the abutment and the molded threads disposed on the inside of the spout portion are illustrated in detail.
The broken line portions of the drawing figures are included to show unclaimed subject matter only and form no part of the claimed design.