JBibbs, it looks like you have DuraVent pipe, if so, you have to seal every joint and seam with silicone or high heat tape. Even then, you might be getting a leak from the stove adapter from in between the inner pipe and outer pipe, as the smoke backs up from the leaky joints. Its a PITA to put silicone in that gap of the adapter when attached to the stove. And after you get done sealing and taping, it might not look pretty. Sorry you are having so much trouble with it. I have been there and know the frustration. Kykel, thanks for the info on the flange collar, I will detach my stove this weekend and will check out that connection as i still get a faint smokey smell sometimes. If i remember the camera I will post a pic.