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. In an emergency, why would you or your buddy breathe from an inferior regulator? An octopus should breathe easy. All Atomic second stage primary models are available as dedicated safe seconds with high visibility yellow covers and an extra-long 36" hose.