Opened my pool this weekend, and while screwing in the drain plugs to the 1987 heat exchanger, I noticed that the threads for the ¾†plug were non-existent. I’m talking absolutely smooth – see photo. Don’t know what happened (other than they rusted away), but I’m looking for suggestions on plugging this hole. My first attempt will be a mechanical plug, but I’m not sure how it will fare with the elevated temperatures. Alternately I could try and rethread the hole for a larger plug. I don’t have the tap, but I’m guessing a 1†would be the next common size up. Would there be any concerns with a 1†tap?
Thanks
Thanks