Mask valve

Add a valve to any type of mask for easier breathing.


### How to make?
Please follow the pictures below

* Cut a membrane. This can be made from plastic refrigerator bag with a diameter of 26mm. Cut a small hole about 2mm in diameter in the center.
* Chose your mask. Fold the mast several times on the center. Cut a small piece at the folded tip.
* Insert the inner part from inside to outside. Place the membrane.
* Tighten the outer part.
* Check that the membrane is in its place and it is flat.

A valve membrane **must be installed before use !**
Valve diameter is 35mm. You may scale up in x-y if you need a bigger valve.