Foot spa tub

FIG. 1 is a front, top perspective view of a foot spa tub showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an enlarged detail view taken from portion 8 of FIG. 7 .

The evenly-dashed broken lines show portions of the foot spa tub that form no part of the claimed design. The dot-dash broken lines depict the boundary of the enlarged views and form no part of the claimed design.