NATO Gas Mask Adapter 40mm to SECURA Filter
thingiverse
DO NOT USE THIS DESIGN! IT DOESN'T SEAL! New, improved adapter: 4277336 Full-face dust masks are very costly but full-face military surplus masks are relatively inexpensive. Therefore, I created an adapter from NATO 40mm x 1/7 (gas mask standard thread) to Secura filter connector. Secura is a Polish local brand of safety equipment. It's likely that this adapter will be useless for you if you don't reside in Poland. If you require an adapter for 3M filters, @tkmarsh has already made one: thing:2796484
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