Decathlon Mask One-Way Valve
thingiverse
A one-way valve is preferred to prevent exhaled air from flowing back up the O2 line to the patient. This type of valve reuses the membranes that need to be removed from inside the mask. The valve must come before the reservoir bag, if it's used. Currently, the Male-to-Female configuration is the recommended setup. Check out my profile for DAVE connectors with an integrated valve. It's best to use the mask membranes, but a M2 Bolt paired with a round piece of plastic, like a zip-lock bag, can work as a substitute for the integrated membrane. You can find the rest of the parts on my profile and at https://gitlab.com/ma-d-kers/library.
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