Replaces damaged or worn out exhalation valves Maintains the appropriate level of protection and comfort Specially designed for use with 3M ™ reusable full face masks of the 6000 series Quick and easy placement Increase the life of your equipment The 3M ™ 6889 exhalation valve is a quick and easy - to - attach spare part, and is specially designed for use with the 3M ™ Reusable Full Masks of the 6000 series. Make sure you have the right level of protection and work comfortably with the 3M ™ 6889 exhalation valve. It is easy to attach and helps increase the lifespan of your complete 6000 series mask. This exhalation valve replaces damaged or worn parts , and is specially designed for use with the 3M ™ Reusable Full Masks of the 6000 series.