DotPro 320 40mm Gas Mask Filter
 
40 mm x 1/7” NATO filter standard (EN 148-1:1999) threading
Built to comply with a wide variety of international standards, including EN 14387:2004+А1:2008, EU Health and Safety requirements
Practical multi-gas filter that protects the user from toxic industrial chemicals (TICs) and other threats
7.5-year shelf life, with expiration date clearly marked on the filter housing 
Easy to deploy and color-coded based on the protection it offers