The ornamental design for an irrigation tap timer, as shown and described.
FIG. 1 illustrates a top, front, and right side perspective view of an irrigation tap timer embodying a new design.
FIG. 2 illustrates a bottom, back, and right side perspective view of the irrigation tap timer of FIG. 1.
FIG. 3 illustrates a front view of the irrigation tap timer of FIG. 1.
FIG. 4 illustrates a back view of the irrigation tap timer of FIG. 1.
FIG. 5 illustrates a right side view of the irrigation tap timer of FIG. 1.
FIG. 6 illustrates a left side view of the irrigation tap timer of FIG. 1.
FIG. 7 illustrates a top view of the irrigation tap timer of FIG. 1; and,
FIG. 8 illustrates a bottom view of the irrigation tap timer of FIG. 1.
Broken lines are used to illustrate features of the irrigation tap timer, which form no part of the claimed design. Dot-dash lines are used to illustrate boundary lines and form no part of the claimed design.