FIG. 1 is a top perspective view of a plug cap in accordance with the present design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view (back elevational view is the same) thereof;

FIG. 5 is a sectional view taken in the direction of the arrows on line 5--5 of FIG. 2; and,

FIG. 6 is a top plan view thereof, in the compressed condition.