FIG. 1 is a perspective view of an aperture cover showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevation view thereof;
FIG. 7 is a right side elevation view thereof; and,
FIG. 8 is a perspective view of the design in a use environment engaged over the aperture of a vacuum separator.
The broken lines in the figure drawings represents unclaimed environment only and form no part of the claimed design; and the dot-dash broken lines in the figure drawings represent an unclaimed boundary of the claimed design that forms no part thereof.