Combination filter with a Dräger-specific bayonet-type connector to be used with twinfilter half masks Dräger X-plore 3000 and twinfilter full facepieces Dräger X-plore 5500. - A1: protection against gases and vapours from organic compounds Filter class 1 offers low protection and has a maximum permissible contaminant concentration of 0.1 Vol% (1000 ppm). - P3: particles up to concentrations of filter class 3: 99.95 % efficiency - marking R: for use during several work shifts - marking D: dolomite dust testing additionally passed