Used with 3M Particulate Filter 5N11 or 3M Particulate Filter 5P71 and 3M Filter Retainer 501.The 3M Filter Adapter 603 enables the 5N11 and 5P71 N95 and P95 prefilters to be directly attached to a 3M Full or Half Facepiece 6000, 6500, 7000 or FF-400 Series or 3M Scott AV-3000 HT and AV-3000 SureSeal facepieces with 3M Scott AV-632 Bayonet Adapter. Do not use the filter adapter 603 with the 650XQL Series half facepiece. The filter adapter 603 may be used multiple times. It provides a cost-effective filtering solution when multiple filters are needed for 3M elastomeric facepiece