Cover for 3M™ reusable mask filter, 501

Cover 501 attaching 5000 series filters to respirators (6000 and 7500 series) and 3M masks (6000). For use with 6000 series canisters or cover 603. The cover allows the use of the selected filter or canister, and such a set is attached with a bayonet connection to the mask or respirator. A set for a mask / respirator is 2 pieces.