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Does anyone have a source for very large silicone barrel bungs? I have a 15Hl cask that has a roughly 70mm bung hole on the top that did not come with a bung. I can't seem to find a supplier that carries anything in this size range other than something like a #40 jar cork, which seems less than ideal. My only other option is to make an oak insert myself to adapt the existing hole down to 50mm so I can use standard bungs. I already looked at Alasco rubber and they don't seem to stock anything this big. Any other suggestions are welcome, thanks.