Atomic Aquatics Z3 RegulatorThe Atomic Aquatics Z3 Regulator combines a compact design with consistent, smooth breathing for scuba and diving applications. Built for saltwater use, it uses chrome plated brass, 316 stainless steel, and titanium components with zirconium plating to resist corrosion in harsh underwater environments. The Z3 is Nitrox ready for non dedicated EAN use with mixtures up to 40%, and the yoke version shell packs performance into a practical 2. 6 pound