Shown here is a "D" tank which is extremely portable and it can be moved easily between treatment rooms or even brought into your dental office's reception area if needed. This tank will support a patient for more than six hours at a six liter flow. This unit comes with a single support hose attachment regulator, two disposable masks -adult and pedo, and three nasal canulaes. Remember, the quicker you can get oxygen support to your patient and get an airway established, the greater your chances of avoiding a medical emergency all together.