The ornamental design for a holding tankrinserhead, as shown and described.
FIG. 1 is a front elevational view of a holding tank rinser head showing our new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a right elevational view thereof;
FIG. 4 is a left elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top, right front perspective view thereof;
FIG. 8 is a bottom, right front perspective view thereof; and,
FIG. 9 is a reduced top, right front perspective view of our design shown in use.
The broken line showing in FIG. 6 is to illustrate portions of the article and form no part of the claimed design. The broken line showing of the foreshortened holding tank rinser in FIG. 9 is included for the purpose of illustrating environmental use only and forms no part of the claimed design.