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Aluminum radiators are very popular today as replacements for traditional copper/brass radiators typically found in our classics. The aluminum sheds heat more efficiently than the copper/brass design, and Flex-a-lite's Flex-a-fit takes it a step further with tanks that feature fins, both internally and externally. The fins increase surface area by 300 percent for increased heat dissipation—on average 40 percent more efficient than a copper/brass tank design. The external fins also allow the mounting of fans and accessories like overflow tanks.