Hey folks, thanks for the advice so far! Out test run outdoor was successful, starting the build indoors. We're laying out the exit flue and wondering, what to use for a clean out plug. We have an 8" exit flue and have two Tees for cleanouts (placed so we can access all parts of the whole run for cleaning). I have a metal CAP made for the Tee but it's not a tight fit. I'm worried about noxious gases leaking out. I also saw a metal PLUG is available for the 8" pipe, which is different than the end cap that I have, and might be a tighter fit, I don't know. What do people use to plug the clean out?? I saw a video clip with Ernie and Erica and they pointed out their clean out plug which they said was only $12 and seemed to fit tight. Anybody know what that item is exactly and where can we get one? Or have any other suggestions?