Use as a replacement part for 3M Full Facepieces 6700, 6800, 6900 (07138, 07139, 07140 AAD). From the Manufacturer The 3M Head Harness 6897/37005 (AAD), Respiratory Protection Replacement Part works with 3M Full Facepieces 6000 Series (all sold separately). This product is an approved 3M replacement part to maintain the original service quality of the facepiece. Using this replacement part can extend the service life of respiratory protection equipment and potentially result in cost savings. For more than a century, 3M has applied innovation and technology to improving our customers’ lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. Occupational Health and Environmental Safety products, focused on worker safety, include respirators, hearing-protection products, air-monitoring devices, environmental-safety products, and comprehensive training programs. The 3M brand, across thousands of products, represents consistency, superior quality, and value.