Product Description 3M, 6 Pack, Pre-Filter, Filter Takes Out Particulate While Cartridge Underneath Filters Vapor, For Use Over The Entire Line Of 5000 and 6000 Series Respirator Cartridges, N95 NIOSH Approved. From the Manufacturer 3M Particulate Filters must be used with a 501 filter retainer in combination with 5000 series respirators and 6000 series cartridges. There are 6 per package . 3M respirator accessories offer users an effective way of meeting OSHA respiratory protection standards. 3M has respirator accessories with innovative features and technologies that best meet your needs

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