This listing is for a set of 3 qty brand new, unopened, sealed in original mfg plastic, filter canisters. CP3N gas mask filter canister, 40 mm NATO threaded, fits all standard 40 mm NATO full-face respirators and gas masks such as 3M 6700/6800/7800 series and other compatible masks. Designed for tear gas/riot control agent and particulate filtration applications. OEM product details from 3M’s specification page: 3M CP3N Canister Product Info – Enviro Safety Products. 3M Canister CP3N, 450-02-11R06. The 3M Canister CP3N, 450-02-11R06 is a trusted gas and vapor canister engineered for critical protection in chemical, industrial, and defense applications. Featuring rugged construction, specialized filtration for select chemical agents, and seamless compatibility with designated 3MT PAPR systems, it delivers consistent and dependable respiratory safety. It’s an ideal choice for professionals who demand reliability in high-risk environments. This product meets stringent NIOSH standards for chemical cartridge respirators, ensuring regulatory compliance and user confidence.