This is the Scubapro MK25 EVO DIN 300/S620 Ti Scuba Diving Regulator Features: High Performance, Reliable Scubapro Technology & Value Superior Ultra-High Airflow System Maximum Performance in All-Temperatures & Conditions 3/8 Threaded Low-Pressure Hose More Air On-Each Inhalation Nitrox Compatible Up to 40% Oxygen Scubapro Mark 25 EVO Regulator DIN, First Stage: Superior Cold-Water Performance Equal to Scubapro's MK17 First Stage EVO: Means Evolution, Revolutionizing Existing Technologies to Higher Performance High Performance, Reliable Scubapro Technology and Value Superior Ultra-High Airflow System, Maximum Performance in All-Temperatures & Conditions Ultra-Stable Intermediate Pressure High Performance in Warm and Cold Water to 3336 psi (230 bars) Meets New EN250-2014 Requirements CE Approved for 3360 psi (230 bars) in Cold Water Conditions Increased Cold Water Efficiency by 30% Over Previous MK25 Regulator Air-Balanced Flow-Through Piston Design Balanced Composite/Stainless Steel Flow-Thru-Piston HP Ports: Two 7/16" Threaded LP High Flow (HF) Ports: Five 3/8" Threaded Scubapro S620 Ti Second Stage Regulator: Air-Balanced Second Stage Valve Smooths-Out Inhalation Effort at Varying Depths & Supply Pressures Rugged Reinforced Techno-Polymer Case & Front Cover Stainless Steel Frame Looks Good Plus, Design Able to Withstand Years of Aggressive Diving Full Titanium Barrel: Rugged, Anti-Corrosion & Lightweight for Long-Term Reliability Large Diaphragm Fits Inside More Compact Casing for Maximum Breathing Sensitivity LP Ports Mounted on Swivel Turret Cap for Maximum Hose Routing SCUBAPRO's top regulator technology is on display in this high-tech, ultralight reg system. The MK25T EVO is machined from a solid block of titanium which will not corrode, even in concentrated saltwater conditions, promising years of trouble-free use. It offers excellent resistance to freezing, superb inhalation sensitivity and instant delivery of air on demand. The new S620 X-Ti embraces the best features of SCUBAPRO's renowned S600 in an upgraded, state-of-the-art design. Smaller and lighter but using the same-sized diaphragm, the S620 X-Ti delivers effortless airflow under all dive conditions. The titanium inlet tube is super-efficient, the large purge button improves water circulation and the new exhaust tee enhances overall performance."