We claim the ornamental design for a funnel for household use, as shown and described.
FIG. 1 is a perspective view of a funnel.
FIG. 2 is perspective view of the funnel in FIG. 1 with some external surfaces in hidden lines. The hidden lines in FIG. 2 are claimed and are shown as hidden lines to show the shape and location of an internal component that is visible in FIGS. 7 and 8.