The 3M Dual Catridge Respirator conforms to the contours of your face. It seals comfortably and remains sealed, even while talking. Plus, the seal is extra-wide, so it fits more facial types. No inhalation valves to stock. No installation. Less maintenance, less parts. Cartridges snap-in, which eliminates misthreading. Plus, the weight is distributed evenly, without pressure points. The low profile provides a larger field of vision than any other respirator and makes it easier to wear safety eye wear. Be sure to review all fitting instructions and safety guidelines in the user manual prior to using this product. 2 Organic Vapar/Acid Gas Assembly included.