Secura/Maskpol DAR filter adapter

thingiverse

Design was put through rigorous testing by a paramedic, but of course you use it at your own risk, as it's not professional medical equipment. A design prototype was thoroughly tested by emergency medical technicians, yet obviously you're using it on your own responsibility, as it is no professional medical device. Emergency medical responders extensively tested the design, but naturally you'll be utilizing it on your own accord, since it doesn't qualify as genuine medical apparatus. A paramedic put the design through its paces, with clear warnings that you use it at your own peril - after all, this isn't proper medical gear.