The ornamental design for a retainerplate for a pump, as shown and described.
FIG. 1 is a top front perspective view of a retainer plate for a pump showing my new design, with the bottom rear perspective view being identical thereto.
FIG. 2 is a top plan view thereof, with the bottom plan view being identical thereto; and,
FIG. 3 is a front elevation view thereof, with the back elevation view, the left side elevation view, and the right side elevation view being identical thereto.
The dash-dash broken lines shown in the drawings illustrate portions of the retainer plate that form no part of the claimed design.
CORRECTIVE ASSIGNMENT TO CORRECT THE U S PATENT APPLICATION NO 29 536,039 AND INVENTOR SIGNATURE DATED 02 05 2016 PREVIOUSLY RECORDED ON REEL 038435 FRAME 0825 ASSIGNOR S HEREBY CONFIRMS THE ASSIGNMENT