Bathtub

FIG. 1 is a front view of a bathtub embodying my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top perspective view thereof.

The broken lines shown in the figures depict portions of the bathtub that form no part of the claimed design.