FLITE COV supplied air respirators (SAR) with breathing apparatus from Scott Safety feature an automatic changeover valve for an emergency air supply cylinder, available in different durations, and a locking hand wheel on the cylinder pressure-reducing valve to prevent inadvertent shut-off during use. It also features use of the compact Tempest Demand Valve, and is compatible with multiple approved Scott Safety facepiece options. 800/247-7257; www.scotthealthsafety.com.