The SR2 regulator continues the legacy the SR1 created. It packs advanced technology into a compact case, employing contemporary styling and utilizing a multitude of cutting edge materials. Superior breathing performance of less than 0.5 joules/liter, W.O.B. at 165 fsw, 62.5 RMV. The SR2 is more technically advanced and more attractive than its predecessor. 2nd Stage Features One touch performance adjustment Pneumatically balanced second stage Super flex hose Nitrox ready up to 40% Large flexible purge cover SMART Demand Lever - relieves load on seat. Extends seat's life while in storage Improved flexible purge cover 1st Stage Features include Completely dry and environmentally sealed Five low pressure ports on a 360 Degree swivel Two high pressure ports Two-piece piston for precise optimum balance and intermediate pressure control Available in 300 BAR DIN.