These particular Derale Tube-Fin Coolers, part # D13309 and part # D13212, are copper tube with aluminum fin construction. Most of the coolers available will use copper and aluminum. Copper is used because it has excellent heat transfer abilities so it can transfer heat easily to aluminum which has excellent heat dissipation properties. Stainless does not transfer or dissipate heat as well.
Derale does offer some all aluminum coolers where both the tubes and fins are made of aluminum for... view full answer...
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