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I am in the process of designing a modular, hobby sized still with a 15.5 gal boiler and 2-3 4” diameter columns, and curious about what size copper tubing I should use for the vapor paths. Since the larger size copper pipe gets pricey fast, I was curious what people thought would be the minimum diameter that would not cause issues with this size system. Even on commercial stills, it looks like 1-2” is common, could I get away with say ¾” copper without back pressure or flow restriction? Thanks in advance!