XRT PRO 2.0 Scotts SCBA firefighter mask quick release Insert is the future of life-saving FireFighter respiratory performance. This innovative firefighter breathing apparatus also referred to as an air restriction mask, is a game-changer in self-contained breathing equipment. The SCBA mask quick-release technology was created to improve endurance, stamina, and performance for firefighters and first responders. XRT PRO 2.0's SCBA firefighter AV2000 / AV3000 mask insert is an optimized design to increase breathing resistance, giving you the ultimate on-scene low-bottle O2 breathing experience during breath-demanding firefighting scenarios.