Replaces damaged or worn center port adapters Maintains proper level of protection and comfort Includes a center adapter, exhalation valve and screen gasket Quick and easy fitting Designed for use with 3M™ 6000 series reusable full facepiece masks Increases the life of your equipment .The 3M™ Exhalation Valve Center Adapter 6864 replaces worn or damaged parts of 3M™ 6000 Series reusable full facepiece masks. This kit includes a center adapter, exhalation valve and shield gasket. Make sure you have the right level of protection and work comfortably with the 3M™ center adapter with exhalation valve 6864. It is easy to attach and helps increase the life of your 6000 series full facepiece.This set includes a center adapter, exhalation valve and shield gasket, and is specially designed for use with 3M™ 6000 series reusable full facepiece masks.