The SR3 provides superior breathing performance, in which only a few regulators in the world achieve. Less than 0.65 joules/liter of WOB at 50 msw(165fsw) &625. l/m RMV. The SR3 is the ONLY Flow Through Piston Regulator that is both environmentally sealed and Internally Dry while still providing a Depth Compensation mechanism. Which is no easy task to accomplish. Sherwood&&';;s Three Pin Link (3PL) transfers the environmental pressure to the piston and provides consistent flow at any depth. 1ST STAGE FEATURES a Completely dry and environmentally sealeda Five low pressure ports on a 360Adeg swivela Two high pressure portsa Two-piece piston for precise optimum balance and intermediate pressure controla Three Pin Link (3PLa Special Edition Platinum finish to celebrate Sherwood&&';;s 70th year in the diving industrya Improved performance 2ND STAGE FEATURES a Special Edition Platinum finish to celebrate Sherwood&&';;s 70th year in the diving industrya Seat Saving Floating Crown (SSFC) - Extends seat life while not in usea One touch performance adjustmenta Pneumatically balanced 2nd stagea Super flex hosea SMART Demand Lever - relieves load on seat. Extends seat&&';;s life while in storagea Improved flexible purge cover