The 2003 ZX/50D regulator has a convenient and ergonomic swivel hose design. It has proven itself from the Antarctic to the tropics, in deep technical dives as well as in recreational use. Zeagles conical precision high-pressure valve provides much greater reliability and service life compared to conventional designs, while improving responsiveness and performance at all breathing rates. First Stage Features: * Swivel Hose mount * Conical precision HP valve * Dry Environmetal Seal with Hydro Transmitter * Balanced Diaphgragm Zeagle's ZX Second Stage is lightweight, compact and comfortable, with diver adjustable resistance controls, freeflow control, and built in anti- freezing features. Specific design changes have created a regulator that is resistant to freeflow on the surface, yet has incredible smoothness and ease of breathing underwater. ZX Second Stage Features: * Downstream valve * Balanced Diaphragm * Dive/ Pre Dive Venturi Control * Diver Adjustable Breathing Sensitivity The ZX/50D comes factory ready for use with EAN / NITROX to 40% O2.