bayonet closure allows filters to be easily and reliably attached; in case of saturation or damage, replace the filter; filter against gases, vapors and particles 6092 protects against organic vapors (boiling above 65° C), inorganic vapors, acid gases, ammonia and its derivatives and formaldehyde up to 10 ppm; suitable for use with 3M ™ reusable masks series 6000, 7500, 6500QL with bayonet system