I used those rubber couplings as well. However, I used them differently. I used piece of 2" PVC (outside diameter 2 3/8") to extend from inside the kegerator to the top of the tower. I used a rubber cap from HD to top off the PVC, and used the rubber coupling inside the kegerator to deal with the small gap between the PVC and the hole.
It required a bit of work to get the PVC pipe cut down the fit around the tap holes at the top of the tower, but it works quite well.
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