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3M 603 Filter Adapter - 2 Count The 3MTM Filter Adapter 603 enables the 5N11 and 5P71 N95 and P95 prefilters to be directly attached to a 3MTM Full or Half Facepiece 6000, 7000 or FF-400 Series Respirator. The filter adapter 603 may be used multiple times. It provides cost-effective filtering solution when multiple filters are needed for 3M elastomeric facepieces. The filter adapter 603 may be used multiple times on all 3M full or half facepiece 6000 and 7000 series respirators. It provides a cost-effective filtering solution when multiple filters are needed for elastomeric facepieces.