3M Filter Adapter 603 Respiratory Protection System Component [Pack of 2] & 501 N95 PREFILTER RETAINER [pack of 2] set</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Approved 3M system component</li><li>Designed to attach 3M Filters 5N11 and 5P71 N95 and P95 with 3M 501 Filter Retainer</li><li>Filter adapter may be used multiple times for convenience</li><li>Cost effective particle filter solution</li><li>Component works with 3M Full or Half Facepieces 6000， 7000， or FF-400 Series Respirators (sold separately)</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41yXX5l-K1L.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/21sDenw61oL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51cx9MbfFqL.jpg' noproxy></br>