The ornamental design for an eartip for hearingaid, as shown and described.
FIG. 1 is a top view of an ear tip according to the invention;
FIG. 2 is a side view thereof;
FIG. 3 is another side view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a top perspective view thereof;
FIG. 6 is a bottom perspective view thereof; and,
FIG. 7 is another bottom perspective view thereof.
The broken lines in FIG. 4 show portions of the ear tip for hearing aid that form no part of the claimed design; the broken lines form no part of the claimed design.