The regulator of choice for the most formidable of divers. The Xstream works with air, nitrox, trimix or 100% oxygen. Certified for use down to 200 m / 656 ft, this regulator never quits, giving it the honored place as the US Navy's, US Coastguard's and the NYPD's preferred regulator. There is no other way to put it - the Xstream has earned its name.