3M™ Prefilter 7711 series and 3N11CN can be attached to 3M™ 3000 series and 7700 series Gas & Vapor cartridges to provide particulate protection from certain solid and liquid particles when used with Single facepieces. Use the 3M™ Filter Retainer 774 or 395CN to attach one filter to each cartridge. 3M™ Prefilter 7711 series and 3N11CN is a versatile solution engineered to help protect workers in a wide range of industries. Use 3M™ Prefilter 7711 series and 3N11CN with 3M™ Gas & Vapor Cartridges and the 3M™ Filter Retainer 774 or 395CN. This prefilter helps protect against certain particulates including dusts, mists, fibers, and metal fumes. 7711 series and 3N11CN is compatible with 3M™ Single Half Facepiece Respirators 1200 series, 3000 series 7000 series and HF-50 series.