The ornamental design for a pressurewasherpumpcouplingassembly, as shown and described.
FIG. 1 is a perspective of a pump and coupling assembly for vertical shaft pressure washers embodying the design of the present invention;
FIG. 2 is a top plan view of the pump and coupling assembly;
FIG. 3 is a left side elevational view of the pump and coupling assembly;
FIG. 4 is a front elevational view of the pump and coupling assembly;
FIG. 5 is a right side elevational view of the pump and coupling assembly;
FIG. 6 is a rear elevational view of the pump and coupling assembly; and,
FIG. 7 is a bottom plan view of the pump and coupling assembly.
The broken lines in FIG. 7 are included for the purpose of illustrating a portion of the pressure washer pump coupling assembly that forms no part of the claimed design.