Gas filter with Dräger-specific bayonet type connector to be used with full facepieces Dräger X-plore 5500. - A2: protection against gases and vapours from organic compounds - B2: protection against inorganic gases and vapours (e.g. chlorine, hydrogen sulfide, hydrogen cyanide) - E2: protection against sulfur dioxide and hydrogen chloride - K2: protection against ammonia and organic ammonia derivatives Filter class 2 offers medium protection and has a maximum permissible contaminant concentration of 0.5 Vol% (5000 ppm).