Semi-rectangular chemical cartridges have an increased surface area thanks to their innovative shape Reduced breathing resistance, means improved breathability Keyless bayonet-style attachment makes assembly quick and easy Pair with 7740 P100, 7970 R95 or 7910 N95 particulate filters For use against particulates when no oil is present, use with 7910 Pre-Filter and 7927 Piggyback Adapter For contaminants that fall under an OSHA substance specific standard requiring a High Efficiency Particulate Air (HEPA) filter use with 7740 P100 Filter Disk and 7927 Piggyback Adapter 100% PVC-free, for reduced environmental impact NIOSH approved For Use With 7800 Series Full Facepiece/7000 Series Half Facepiece/9000 Series Full Facepiece Type Gas/Vapour Cartridge