Poseidon Xstream 2nd Stage 9/16 Octo Scuba Diving Octopus Features: Trimix, nitrox, oxygen and air 95% Helium mix could be used 100% O2 Certified 200 m / 656 ft approval Norwegian Norsok U101 standard Approved to cold water standard, EN250 Approved for use under ice down to -1,6 AdegC / 29.12 AdegF without CWD kit Unique internal Thermo Dynamic Anti-freeze system (TDA) 2nd stage could be used either from left or right Upstream 2nd stage valve Low WOB - Servo assisted The regulator of choice for demanding divers using air, nitrox, trimix or oxygen. Outstanding performance and certified to 200 meters / 656 feet.