KYNG Gas Mask NBC 40mm Filter CONVENIENT: Compact size and 10+-year shelf life, manufactured in 2024. Easy to stockpile and suitable for long-term storage, the filters are safe to use until the expiration date that is marked on the filter housing. The sealed plastic canister can seamlessly fit into any emergency preparedness or survival kit and features durable, rugged construction for reliable operation and protection when you or your family needs it the most. KYNG Gas Mask NBC 40mm Filter VERSATILE: Flexible, full-range protection. A practical multi-gas filter with P3 particle filter, the helps protect the user from known respiratory threats, such as toxic industrial chemicals (TICs) and biological particulates. This user-friendly 40mm filter cartridge is easy to deploy so you can quickly identify the protection our respirator filters offer at a glance without wasting precious minutes. KYNG Gas Mask NBC 40mm Filter UNIVERSAL: NBC NATO standard size. Engineered with a 40mm x 1/7" threading, the multi-gas filter is compatible with your existing full-face CBRN respirator mask. These premium threaded filters for gas masks are built to comply with a wide variety of stringent international standards.