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Oops, my bad, I forgot to mention that the main problem is we are trying to size it without knowing the sytem volume, thus the reason for using the old one's size.

Hi guys, I am an engineering technologist that is new to the field. We are doing a retrofit on some apartment buildings and we need to switch over from an older style expansion tank (without diapraghm) to the new style. We were wondering if there is a quick easy method to use the old one's size...