The ornamental design for a funnel apparatus, as shown and described.
FIG. 1 is a perspective view of a funnel apparatus of the present invention;
FIG. 2 is a perspective view of the funnel apparatus of the present invention with the canister shown removed to show aspects of the design that are not visible when combined;
FIG. 3 is a front elevational view of the funnel apparatus of FIG. 2 with the rear, left side, and right side elevational views being identical to the front elevational view;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom view thereof.
The broken line showing of environmental structure is for illustrative purposes only, and forms no part of the claimed design.