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Product Description
If anyone has a mask that uses those old style ROUND filter cartridges that are obsolete and almost impossible to find even without the crisis. This file will adapt them to use modern 3M style cartridges with bayonet connections. (the round kind with 3 sliding tabs). You will need 2x per mask.
You will still need the rubber vavle that attach to this. If you do NOT have access to them, Please see my shop, I will also have them available in TPU and you will need 2x each as well.
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