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Most Scuba tanks are filled with compressed air (same as the "normal" air we breath) 21% Oxygen and 79% Nitrogen. The tanks are a variety of colors and the color does not signify anything. Special NITROX tanks have a bold Yellow and Green band which goes around the tank and is usually 8" wide. NITROX can have a range of between 32% and 50% oxygen (the balance is nitrogen). This yellow/green band - with the word NITROX can be placed on any color tank. Special tanks with exotic gas mixes will be indicated with special bands - there is no standard colors for exotic mixes.

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