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I always wanted to make such a milking cylinder with an inliner that acts like a milking cup used for milking cows, mares or goats. Unfortunately I wasn't able to identify a bicycle inner tube with the according inner diameter that would fit for my big cock ((8" long and 2,25" wide). Recently I finally found such a tube which could stretch from 2 - 2.5", perfect for my construction. The outer tube is made of HT pipes. Up to now it works exaclty the way I planned, however it seems that I will need pumps with higher volume flow.