The ornamental design for a pump handle, as shown and described.
FIG. 1 is left, top, front perspective view of a pump handle according to our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right end elevational view thereof;
FIG. 5 is a left end elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof with cylinder environment shown broken away.
The broken line representations in the figures are for the purpose of illustrating unclaimed environment. The broken lines are thus not part of the claim.