The ornamental design for a funnel apparatus, as shown and described.
FIG. 1 is a perspective view of the funnel apparatus of the present invention;
FIG. 2 is a perspective view of the funnel apparatus of the present invention;
FIG. 3 is a front elevational view of the funnel apparatus of the present invention with the rear, left side, and right side elevational views being identical to the front elevational view;
FIG. 4 is a top plan view of the funnel apparatus of the present invention; and,
FIG. 5 is a bottom plan view of the funnel apparatus of the present invention.
The broken line showing of environmental structure is for illustrative purposes only, and forms no part of the claimed design.