THREAD SAVER® will help prevent serious valve thread damage that will disable your SCBA just when you need it most. THREAD SAVER® will save you money. Thread protectors are needed for Survivair/Sperian SCBA, Scott SCBA, MSA SCBA, ISI SCBA, Draeger SCBA, Interspiro SCBA, Cairns SCBA and North SCBA. Firefighters swear by THREAD SAVERS® ability to protect their soft aluminum cylinder valve threads. THREAD SAVER® provides protection by helping to keep dirt, dust, mud, grit, sand, snow, ice and water away from your LP or HP cylinder valve threads and valve orifice. All across the country, SCOTT, MSA, SPERIAN, etc. users, swear by them. THREAD SAVERS® are an inexpensive insurance against serious valve thread damage and the need for cylinder valve repair.