The NBC-77 SOF filter canister, in combination with a full-face mask, mouthpiece assembly, or PAPR, reliably protects air passages against a wide range of harmful and highly toxic substances including all known CBRN agents. The filters are produced with standard round threads according to STANAG 4155 (EN 148- 1)- Rd 40x1/7"". The filter components are made of hard plastic. This results in a very robust product that is extremely durable against shock and impact damage in operational use. KEY FEATURES:

• Compatible with standard 40mm NATO threaded respirators, which are widely available.
• 20-year shelf life - save money long-term by not having to replace your filters every 5 years
• Used by military personnel, CBRN specialists, and special operations forces all over the world
• Filter all known CBRN agents, including radioactive iodine, rated for A2B2E2K2HgSXP3 D R.
• Certified by European agencies and has the “CE” symbol. Compliant under EN 14387:2004 + A1:2008