Firehawk SCBA Filter Adapter

I saw a request from a fire department for an SCBA Filter. This is emergency PPE to adapt the SCBA mask to be used as a PPE for COVID-19 or other. My local fire department was kind enough to bring over a mask but unfortunately was not the correct one. I decided to make the filter anyway.

This adapter is for those using a Firehawk regulator. The mask I was testing was a MSA Ultra Elite and had a Firehawk adapter screwed in. The threads on the mask turned out to be the same as a Soviet GP-5 mask (I had for a costume a few years ago). but to use the threads you have to take two screws out and remove the adapter. I'm sure the FD doesn't want to lose the ability to use their SCBA's quickly so the filter is specifically for the Firehawk regulator. It's designed to use the original O-Ring though I can redesign for a standard o-ring if needed. I have the tolerances on the threads set a little loose for easy 3D printing. The intention is to put filter material inside the cover, use the inse