3M to 40mm NATO adapter

3M to 40mm NATO adapter

thingiverse

Allows attachment of standard 40mm NATO filters to your 3m mask/respirator You should get a 40mm gasket for filter attachment. Use at your own risk. V4 is a really basic version V8 is has fillets to prevent damaging the rubber on your respirator and is a bit taller, so it doesn't bump with 7500 half face respirator

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