The ornamental design for a tubfoot well, as shown and described.
FIG. 1 is a perspective view of a tub foot well showing our design;
FIG. 2 is an enlarged top plan view thereof;
FIG. 3 is a top plan view thereof; and,
FIG. 4 is a section view thereof, taken at line 4-4 in FIG. 2.
The dash dot lines immediately adjacent to the claimed areas in the views represent the boundaries of the claimed design. The dashed lines in the figures represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design. None of the broken lines form any part of the claimed design.