FIG. 1 is a top perspective view of a plastic cover showing our design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevational view thereof, the left, right, and rear elevational views being identical thereto;
FIG. 6 is a cross sectional view thereof along the line 6-6 in FIG. 3;
FIG. 7 is an enlarged view of the left end portion of the cross sectional view thereof as indicated in FIG. 6;
FIG. 8 is an enlarged view of the right end portion of the cross sectional view thereof as indicated in FIG. 6;
FIG. 9 is a top perspective view of the plastic cover shown in an environment of use;
FIG. 10 is a bottom plan view of the plastic cover shown in the environment of use; and,
FIG. 11 is a cross sectional view of the plastic cover shown in the environment of use along the line 11-11 in FIG. 9.
The broken lines in FIGS. 1-11 indicate unclaimed portions and environment and form no part of the claimed design. The dot-dash lines in FIGS. 1-11 define the bounds of the claimed design and form no part thereof.