Replaces worn or damaged buconasal parts. Maintains the right level of protection and comfort. Designed for use with the 3M ™ 7907S reusable full mask. Quick and easy placement. Increase the useful life of your equipment. The 3M ™ tubular part is a quick and easy to attach spare part. It is specially designed for use with the 3M ™ 7907S reusable full mask. Make sure you have the right level of protection and work comfortably with the 3M ™ 7991 Hoses Part. It replaces damaged or worn parts, is easy to install and helps increase the life of your 7907S reusable full mask.