US D413166 S
FIG. 1 is a side perspective view of a face mask breathing valve showing our new design, the broken line showing of a face mask is for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a front view of a face mask breathing valve in accordance with this invention;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof with a left side view being a mirror image thereof;
FIG. 5 is bottom view thereof; and,
FIG. 6 is a top view thereof.