FIG. 1 is a perspective view of the design for the pump, wherein broken lines illustrate environmental features including flanges, a fluid inlet, and a fluid outlet;

FIG. 2 is a front elevational view of the design for the pump of FIG. 1, wherein broken lines illustrate environmental features including flanges, the fluid inlet, and the fluid outlet;

FIG. 3 is a right side elevational view of the design for the pump of FIG. 1, wherein broken lines illustrate environmental features including flanges, the fluid inlet, and the fluid outlet;

FIG. 4 is a perspective view of the design for the pump of FIG. 1, wherein broken lines illustrate environmental features including a secondary pump, a drive mechanism, a motor, and a first panel structure;

FIG. 5 is a front/right side elevational view of the design for the pump of FIG. 1, wherein broken lines illustrate environmental features including the secondary pump, the drive mechanism, the motor, and the first panel structure; and,

FIG. 6 is a front/right side elevational view of the design for the pump of FIG. 1, wherein broken lines illustrate environmental features including the motor a second panel structure that cooperates with the first panel structure to surround a portion of the secondary pump and the drive mechanism.

In these drawings, the solid lines illustrate the claimed ornamental design, whereas the broken lines illustrate environmental features that form no part of the claimed ornamental design.