Mares Abyss 22 Navy II Regulator First Stage Features: CWD Kit for Extreme Temperature, High Performance in Cold Water Balanced Diaphragm First Stage, Tri-Material Valve Technology, Dynamic Flow Control (DFC) Chrome Plated Marine Grade Brass, Environmentally Sealed Design Second Stage Features: Heavy-Duty for Demanding Dives, Nickel and Chrome-Plated Brass Case Fluoropolymer Resin Finish, Cold Water Design, Vortex Assisted Design (VAD) Downstream Valve