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 1.
FIG. 4 illustrates a back view of the irrigation tap timer of 1.
FIG. 5 illustrates a right side view of the irrigation tap timer of 1.
FIG. 6 illustrates a left side view of the irrigation tap timer of 1.
FIG. 7 illustrates a top view of the irrigation tap timer of 1; and,
FIG. 8 illustrates a bottom view of the irrigation tap timer of 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.