While designed to replace your octopus, the breathing performance of this backup rig just may tempt you to replace your primary reg. Compact, lightweight and built to last, the SS1 is made with either 316 stainless-steel or titanium components in a fiberglass-reinforced nylon body. It features Atomic's "Seat Saving Orifice," the same one used in Atomic's primary regs, to maintain peak performance over time. With large control buttons and a soft oval purge cover, the SS1 is easy to use, either as a power inflator or backup reg. It also comes with threaded adapters so you can remove it from your BC for cleaning and storage with your primary reg. With all those features and chart-topping breathing machine performance, it was a 2007 Testers' Choice. Stainless--$249M; Titanium--$370. www.atomicaquatics.com.