Mask breather valve

Description

FIG. 1 is a front elevation view of a mask breather valve, showing my design.

FIG. 2 is a rear elevation view thereof.

FIG. 3 is a left side elevation view thereof.

FIG. 4 is a right side elevation view thereof.

FIG. 5 is a bottom plan view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is front perspective view thereof.

FIG. 8 is rear perspective view thereof; and,

FIG. 9 is perspective view of the mask breather valve with the valve half open.

The broken lines illustrate portions of the mask breather valve that form no part of the claimed design.

Claims

The ornamental design for a mask breather valve, as shown and described.