Originally Posted by Wyley
Look in the electrical conduit department at Home Depot or Lowes. They should have something that screws right into that bung hole, and even if it is galvanized its just being used for exhaust. You can even soak it in toilet bowl cleaner and that will eat the galvanizing right off of it.
Thats what I have on my UDS with about 30" stack on the exhaust and there is plenty of draw.
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When all else fails just ask yourself, WWGALD