The second generation BlastMastk-110 Training Regulators have been reengineered and upgraded with enhanced features designed specifically for firefighter training. BlastMask Training Regulators attach to your face piece and simulate real-world SCBA breathing, without draining your cylinders or your budget. And with new enhancements, including a bypass valve and slide latch that mimic SCBA functionality, its even more true to life. So you can train like its real. And be tactically fit when it counts.