NATO Gas Mask Adapter 40mm to SECURA Filter
thingiverse
DO NOT USE THIS DESIGN! IT DOSNT SEAL! New, improved adapter -> thing:4277336 Full-face dust masks are very expensive but full-face military surplus masks are quite cheap. So I made adapter from NATO 40mm x 1/7 (gas mask standard thread) to Secura filter connector. Secura is polish local brand of safty equipment. Most probably this adapter is useless for You, if You don't live in Poland. If You need adapter for 3M filters, @tkmarsh made it already -> thing:2796484
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