Gas Mask Filter Adapter (40mm NATO to 3M 6000 Series)
thingiverse
Adapter for using 3M 6000 series filters on 40mm NATO masks that fit most old Soviet ones. You can easily pick up these filters at no cost on eBay or from your local hardware store, and B&Q has a wide selection available. To achieve a proper seal, you will also need a 40mm o-ring. Special thanks to 3DModularSystems for creating the 3M fitting model that this adapter is based on: https://www.thingiverse.com/thing:1487286 And to uumeran for sharing their design of the 40mm NATO thread, which can be found at: https://www.thingiverse.com/thing:144923
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