The ornamental design for a cap for a widematerial dispenser, as shown and described.
FIG. 1 is a perspective view of a cap for a wide material dispenser of the present invention;
FIG. 2 is a first elevational side view of the cap for a wide material dispenser as viewed along line 2—2 of FIG. 4 of which the reverse side is a duplicate thereof;
FIG. 3 is another side elevational view of the cap for a wide material dispenser as viewed along line 3—3 of FIG. 4 of which the reverse side is a duplicate thereof; and,
FIG. 4 is a top view of the cap for a wide material dispenser as viewed along line 4—4 of FIG. 2.