I wandered around Menards trying to find something 3" ID to used for the tower. I ended up buying a section of 3" ID PVC pipe. OD is 3.5". To get it to seal up on the bottom, try to keep the hole you make a pretty snug fit, allow a ~1/4" to extend into the kegerator, and run a bead of silicone around it.
Hope this helps,
Pat
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