Gas/Vapor cartridges feature a low-profile for greater range of view. Easy to install. Plus, these cartridges are compatible with 6000 Series Half Facepieces, 6500/6500QL Series, 7500 Series, 6000 Series Full Facepieces, FF-400 Series, 7800 Series, 3M™ Scott™ AV- 3000 HT and AV-3000 SureSeal Facepieces with AV-632 Bayonet Adapter, thus helping to reduce inventory needs.