The ornamental design for a handpumpdispensinghead, as shown and described.
FIG. 1 is a front perspective view of a hand pump dispensing head showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof; the left side view is a mirror image of the right side view; and,
FIG. 5 is a top view thereof.
The broken lines shown in the drawings are for the purpose of illustrating unclaimed portions of the hand pump dispensing head and form no part of the claimed design.