Scatola di ricambio prefiltro 3M 5N11 5 paia = 10 ciascuna made in USA
The 3M 5N11 Prefilter is a N95 filter for use with a 501 filter retainer. N95 filters are for use with toxic dusts or mists containing no oil. They are most often used as a prefilter for non-oil based paints or pesticides.