This respirator is simple to handle and comfortable to wear. The exhalation port provides increased durability, easy cleaning and reduced breathing resistance, increasing your comfort and allowing you to work in a safe environment. This respirator has the 3M bayonet connection system allowing connection to a broad range of twin light-weight filters to protect against gases, vapors and particulates depending upon the wearers individual needs. It can be disassembled, cleaned and reused.Details:GrayUse with two each of MT6001 cartridges, MT5P71 particle filters and MT501 adapters for a complete maskEasy-to-adjust head strapsNIOSH approved for negative pressure air purifying and supplied air dual airline applicationsOne size fits most