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The NATO-standard 40-mm NBC-77 SOF Gas Mask Filter Canister reliably protects air passages against a wide range of harmful and highly toxic substances when used in combination with a full-face mask like the CM-6M CBRN tactical gas mask. With an impressive 20 year shelf life this filter is made with standard round threads from hard plastic resulting in a very robust product that is extremely durable against shock and impact damage in operational use. It is rated to provide protection against solid and liquid particles bacteria viruses radioactive particles smoke-producing substances riot control agents choking agents blood agents nerve agents incapacitants herbicides pesticides and other toxic industrial chemicals.