The ornamental design for a stopper for inflatableslide, as shown and described.
FIG. 1 is a perspective view of a stopper for inflatable slide showing our new design; positioned on an unclaimed inflatable slide;
FIG. 2 is an enlarged perspective view of the stopper for inflatable slide;
FIG. 3 is a front elevational view of FIG. 2;
FIG. 4 is a rear elevational view of FIG. 2;
FIG. 5 is a left side elevational view of FIG. 2;
FIG. 6 is a right side elevational view of FIG. 2;
FIG. 7 is a top plan view of FIG. 2; and,
FIG. 8 is a bottom plan view of FIG. 2.
The broken line showing of an inflatable slide is included for the purpose of illustrating environmental structure and forms no part of the claimed design.