Details Designed to hold 3M™ Secure Click™ Particulate Filter D7925/D7935 on 3M™ Secure Click™ D8000 Series Gas and Vapour Filters. Allows for replacement of filters prior to change out of cartridges for cost savings Each filter retainer holds 2 filters on each cartridge Refer to the 3M™ Secure Click™ Particulate Filter instruction manual for more information on compatibility and functionality The 3M™ Secure Click™ Filter Retainer D701 is used to hold 3M™ Secure Click™ Particulate Filters D7925 or D7935 in place on 3M™ Secure Click™Gas & Vapour D8000 Series. For use with 3M™ Secure Click™ Half Facepiece Reusable Respirator HF-800SD Series. Used to hold 3M™ Secure Click™ Particulate Filters D7925 or D7935 in place on 3M™ Secure Click™Gas & Vapour D8000 Series