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."