3M to 40mm NATO adapter
thingiverse
You can attach standard 40mm NATO filters directly to your 3m mask/respirator. It's recommended that you also get a 40mm gasket for filter attachment to ensure a secure fit. Use this setup at your own discretion, as it may not be suitable for all situations. The V4 model is quite basic in its design. The V8 version features fillets on the sides, which are designed to prevent damage to the rubber on your respirator and is slightly taller than the V4. This design change also helps to avoid interference with 7500 half-face respirators.
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