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That information is incorrect. If it is negatively buoyant 4.6lb when full and negative 2.8 when empty it only contains 22 cf of air. I have found Luxfer AL100's to be more buoyant than AL80's.I believe this is the same tank described in the LeisurePro web site.
Luxfer 100 Cubic Foot Brushed Aluminum Tank with Pro Valve
You misread. It is -4.6 lbs when full and +2.8 empty.That information is incorrect. If it is negatively buoyant 4.6lb when full and negative 2.8 when empty it only contains 22 cf of air. I have found Luxfer AL100's to be more buoyant than AL80's.