The dawn of a new era. A pneumatically balanced 2'nd stage in a rental regulator! Totally-redesigned to provide outstanding breathing performance, the Brut maintains dedication to rugged reliability combined with ease of maintenance. The Brut has been the overwhelming favorite for beginners and rental applications for decades because of its simple reliability. Innovation at its best is the way to explain the function of the Sherwood first stage regulator. The first stage regulator incorporates Sherwood's Dry Sealed Spring. This simple yet unique design has a flow-by piston that mechanically balances the air of the first stage ensuring excellent breathing characteristics at full or low cylinder pressures. Balanced flow-by piston design, which is a "fail safe" mechanism, with a patented dry seal internal mechanism to keep the intricate components clean and contaminate free no matter what kind of environment you dive it in, constructed from marine grade chrome plated brass for long life and durability.