The ornamental design for a discharge or suction casing of a ringsectionpump, as shown and described.
FIG. 1 is a front perspective view of a discharge or suction casing of a ring section pump in accordance with our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The contour lines depict illustration only, and form no part of the claimed design.
The broken lines are included for the purpose of illustrating portions of the discharge or suction casing of a ring section pump that form no part of the claimed design.