3M Exhalation Valve Filter 604, Pack of 6 EVF

Works perfectly as an accessory to our 3M Half Facepiece Reusable Elastomeric Respirator 6300, 6200 and 6100. Our family wore these on the plane during the height of the BA.5 wave. These filter exhalation to protect others. We wore them to Canada on flights where masks were required and they were allowed. Still breathable and comfortable.

It's a good thing they come as a pack of 6, because the latches that hold them in place appear to be made out of the same plastic as dollar store tupperware, and you'll probably break the first couple you try to put on

Perfect fit, easy to install.