Check the listing for details. Mares 2XR 1st Stage Regulator w/Oxygen Option. Condition: New. Listed at 199.00 USD. DESCRIPTIONMares has included the 2XR first stage within its product range, due to its simplicity and lightness. Having a very simple structure, it is totally reliable and is also marketed in its Oxygen compatible version. Therefore it can also be used for the use of stages with high percentages of oxygen. Having the AST system too, it can be disassembled in the water and inserted on another stage without being flooded. The key features of the 2XR Technical Regulator are: • Very light: 432 g. Robust and compact • Easy cleaning and maintenance • Piston control • Very simple and reliable • DIN only • AST - Auto Sealing Technology. Keeps the first stage dry. Reliability without any compromises. The system is automatically activated by air. Tested with oxygen and low temperatures in demanding environments. Patented system Please specify Black for Air or Green for O2 when ordering