MSA / SCOTT mask adapter firefighter for 3m standard filter
thingiverse
I think you should consider getting an O-ring (1 ½) and a silicone seal for the filter. The flow at 1.05 is definitely worth it, and you might even want to use four or five of them on the wall count/lines. A friend of mine asked me about this, and I'm proud to say that I made it! An inventor from Autodesk tested both versions and they worked flawlessly. If any of you need a personal modification and happen to be a firefighter, I'll do it for free!
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