FIG. 1 is a top perspective view of a vented contrast media reservoir cap, showing my new design;

FIG. 2 is a front side elevational view thereof, the rear side elevational view being a mirror image thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a bottom perspective view thereof.

The structure shown in phantom is for illustrative purposes only and forms no part of the claimed design.