3m gas mask/dust mask filter cover 501/Filter Retainer 501 for 3M Respirators and Face Masks 750262006800mask
3M - 501 Filter Retainer. 3M Half Face Reusable Respirators offer the user comfort and convenience coupled with the cost savings of a reusable respirator. Reusable - just dispose of the cartridge and filters when used to capacity. The swept back design of the cartridges improves balance and visibility. Can be disassembled, cleaned and reused. Very light-weight. Easy to adjust head straps. NIOSH approved N95. Case of 100.