The Threadsaver tool, If you change sparkplugs, you need Threadsaver. Small inexpensive tool that re-threads and repairs damaged spark plug port hole threads. Amazing.
Thread Saver will help you keep from having to buy a new SCBA valve. Thread Saver will provide protection for your SCBA CGA 346 & 347 cylinder valve threads. Fits Survivair SCBA, Scott SCBA, MSA SCBA, ISI SCBA, Draeger, SCBA, Interspiro SCBA, Cairns S