The ornamental design for a gasket, as shown and described.
FIG. 1 is a top perspective view of a gasket, according to the present design.
FIG. 2 is a front elevation view of the gasket of FIG. 1.
FIG. 3 is a rear elevation view of the gasket of FIG. 1, the rear elevation view being identical to the front elevation view of FIG. 2.
FIG. 4 is a left side elevation view of the gasket of FIG. 1.
FIG. 5 is a right side elevation view of the gasket of FIG. 1, the right side elevation view being identical to the left side elevation view of FIG. 4.
FIG. 6 is a top plan view of the gasket of FIG. 1.
FIG. 7 is a bottom plan view of the gasket of FIG. 1, the bottom plan view being identical to the top plan view of FIG. 6; and,
FIG. 8 is a cross-sectional view of the gasket of FIG. 1, along cut line 8-8 that is visible in FIG. 2.