Vial adapter

FIG. 1 is a front perspective view of a vial adapter;

FIG. 2 is a front view of the vial adapter;

FIG. 3 is a rear view of the vial adapter;

FIG. 4 is a right side view of the vial adapter;

FIG. 5 is a left side view of the vial adapter;

FIG. 6 is a top view of the vial adapter;

FIG. 7 is a bottom view of the vial adapter; and,

FIG. 8 is a rear perspective view of the vial adapter.

The evenly spaced broken lines shown in the drawings depict portions of the vial adapter that form no part of the claimed design.