EASYLOCK Filter for Series 7000 & 9000 masks. No need for additional clips or holders, different gas & particulate filters can be combined. Easy Lock particulate filters can either be connected to the Easy Lock gas cartridge or directly to the mask body. Adapters or particulate pre-filters are not necessary. P3 R D for protection against harmful & carcinogenic dusts, fumes & aerosols based on water & oil, including radioactive particulates & airborne biological substances & enzymes.