The SR2 offers superior breathing performance which only few regulators achieve; less than 0.65 joules/liter of WOB at 50 msw (fsw), & 62.5 l/min RMV. The SR2 is the ONLY Flow Through Piston Regulator that is both environmentally sealed and internally dry, and still offers a depth compensation mechanism. Sherwood’s patented Three Pin Link (3PL) transfers the environmental pressure to the piston and provides consistent flow at any depth. The SR2 1st Stage has a two-piece piston for precise optimum balance and intermediate pressure control, where the 2nd Stage is pneumatically balanced. The SR2 2nd Stage has a Seat Saving Floating Crown (SSFC); which extends seat life when not in use, and One Touch performance adjustment.