Use trimmed surgical glove (or heavy duty, smooth elastomer) as a membrane or other suitable elastomer, 3x M4 14mm bolts, tap/thread the main body. First revision, been demo'd briefly. Please email me for requests in changes for this design, for different sized ports or fittings etc. My email is charlton.christopher@gmail.com. I have attached a ventilator diagram to this design pack, see the one way valve on the center of the diagram. This version has some more adjustments based off a 3D print and some very brief testing (23rd March 2020). I have a PEEP valve also, see my other uploads. UPDATE - I have added a couple of screengrabs to show the print orientation (for FDM). No support material should be necessary