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1. tube expander can save up to 2% of copper 2. 4-6 rows of heat exchanger thickness After years of effort in research & development, we successfully developed a shrinkless tube expander, it can save up to 2% of copper. For instant, a normal expander cause copper shrink 3%, while shrink less expender only shrinks copper 1%.thrust of expanding tube20ton25ton30ton40tonmax.number of expanding ...