Humidifier tub lid

FIG. 1 is a perspective view of a first embodiment of a humidifier tub lid showing our design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a perspective view of a second embodiment of a humidifier tub lid thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a front view thereof.

Where included, broken lines showing environment or structure are for illustrative purposes only and form no part of the claimed design.