Sherwood Scuba SR1 Scuba Diving DIN Regulator SR high performance regulator has superior breathing performance of less than 0.5 joules/liter, W.O.B. at 165 fsw, 62.5 RMV, the SR is the most technologically advanced regulator Sherwood Scuba has produced in its storied 50 year history. The SR utilizes a pneumatically balanced second stage, with a two-piece flow-through first stage piston for precise optimum balance and intermediate pressure control. The first stage is environmentally sealed featuring a dry-sealed spring chamber, two high pressure ports, five low pressure ports on a 360 degree swivel and is compatible with a yoke or DIN attachment. The second stage contains a SMART demand lever and floating crown which reacts to depressurization and relieves the load on the seat, extending seat life while promoting consistent performance. Importantly, the second stage employs a unique single adjustment point to simultaneously set opening effort and high flow performance with one motion--the need to make separate adjustments has therefore been eliminated. The size of the SR control knob has also been optimized to enable easy location and operation, even for a diver wearing gloves. The SR packs its advanced technology into a compact case which employs contemporary styling and utilizes a multitude of cutting edge materials. Less than 0.5 joules/liter, W.O.B., at 165 fsw, 62.5 RMV Pneumatically balanced 2nd stage SMART Demand Lever - reacts to depressurization and relieves load on seat, extending seat life while promoting consistent regulation. Large flexible purge cover. One touch performance adjustment. 1st Stage Two-piece 1st stage piston for precise optimum balance and intermediate pressure control. Dry sealed ambient pressure chamber. Five low pressure ports located on a 360 swivel. Two high pressure ports.