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This instructional video demonstrates the differences between steel scuba tanks and aluminum scuba tanks. When it comes to complexity of scuba diving, Scuba Tanks are the poster child of that complexity. You have aluminum and steel. Steel scuba diving tanks like all tanks come in a variety of shapes and sizes. Steel tanks offer the best all around capabilities for a high capacity at low working pressures. Aluminum tanks are cheaper and come in more sizes to choose from. Aluminum scuba diving tanks are the most common diving tanks in the world. Just about every scuba diving operation in the world uses aluminum tanks. These tanks weigh less than a corresponding steel tank, easier to wear and dive with.