The Atomic Z2 is the newest and most sophisticated product of its type, taking the concept to new levels of convenience, reliability and performance as only Atomic Aquatics can deliver. Features of this outstanding Octo include: ATOMIC Quality Exceeds all expectations Z2 Second Stage Specs: Second stage components are made of precision machined Brass with Zirconium plating and Titanium Patented Atomic Seat Saving Orifice (Titanium) Patented Atomic Automatic Flow Control (AFC) Rapid adjustment knob for manual second stage de-tuning in special situations A new high-flow second stage case lowers breathing effort at any depth from shallow water to beyond the limits Dual material second stage cover enables entire front to be used for purge Dual silicone comfort fit mouthpiece with tear-resistant bite tabs 32 hose Z2 Octo Specs: The Z2 safe second stage features critical metal components of the demand valve are made of Titanium or 316 Stainless Steel and completely corrosion proof The demand valve housing is machined of brass and plated with an exotic Zirconium plating that exponentially outlasts conventional chrome plating 36" hose 2 year/300 dive service interval Limited Lifetime Warranty - not contingent on proof of service Because you Deserve it! DIVE THE BEST! DIVE ATOMIC! "