The ornamental design for a cap for ultravioletsterilizer, as shown and described.
FIG. 1 is a top perspective view of a cap for ultraviolet sterilizer showing my new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a front bottom perspective view thereof showing the cap for ultraviolet sterilizer positioned above a bottle.
The broken lines depict portions of the cap for ultraviolet sterilizer that form no part of the claimed design. The bottle shown in FIG. 8 represents an environment. The dash-dot-dash lines represent the bounds of the claim. None of the broken lines form part of the claimed design.