This product features a proprietary design exhalation valve that increases user comfort by making breathing exhalation easier The unique valve cover design also enhances the protection of the exhalation valve from debris Unique cover design protects the exhalation valve from debris Assembly includes one 3M Center Adapter Gasket 6896 and one 3M Exhalation Valve 7583 Designed to be used with the 3M Full Facepiece Respirator models 6700, 6800, and 6900
