These air valves help evacuate your exhaled breath to help prevent re-breathing your breath. They also do a great job keeping the mask temperature cooler. The flapper valve on the inside opens when you exhale the closes creating a tight seal when you inhale. For installation instructions please take a look at the YouTube video below.
**We understand many people may need these valves but there have been instances of misuse, it is recommended to use one of our filters in a pocket behind the valve as shown in the video linked below**