[Tf175]

Generator exhaust , inside the compartment . I replaced the exhaust receiver pipe ( 2 1/4" O.D. , 2 " I.D. , gen pipe slides into it ) some time ago , now I have exhaust leaking into the coach . The problem is obvious , and of my own making . I didn't look at the old pipe closely enough , missed the packing that is pushed into the bead , assumed that the bead was to keep pipe from pushing through the panel . I machined a steel " donut " , welded it onto the end of the new pipe and that was it , Voila ! exhaust leak . The blower then supercharges the fumes into the cabin . 
 Has anyone developed another way to do the exhaust system with the slide out generator ?  I thought perhaps a flexible pipe or steel braided hose , but probably inviting more problems reinventing the wheel ! That said , I am looking at machining another piece with an internal receiver groove for the packing . Alternatively I could order a tool for beading and go with original style .
Question , looking for a source for the packing , wonder if anyone can steer me ? I have a request at Newell parts , not sure they would still have such a thing , so I am looking at options . 
I have shot myself in the foot so many times it's a miracle I can still walk !!
Chris