The ornamental design for an impeller for pump, as shown and described.
1. Impeller for pump
1.1: Perspective
1.2: Front
1.3: Back
1.4: Left
1.5: Right
1.6: Top
1.7: Bottom
1.8: Perspective view from the bottom
1.9: Perspective view from the bottom
1.10: Perspective view from the bottom
This design relates to an impeller for pump that can be used in combination with a drain motor used in a drain pump; fig. 1.1is a perspective view of an impeller for pump showing our new design; fig. 1.2is a front view thereof; fig. 1.3is a back view thereof; fig. 1.4is a left view thereof; fig. 1.5is a right view thereof; fig. 1.6is a top view thereof; fig. 1.7is a bottom view thereof; and fig. 1.8, 1.9, 1.10are perspective views from the bottom thereof.