I saw an episode where the guys fixed exactly what we have. I'd love to see it again so i can fix ours. In our basement is an abandoned cast iron vent pipe, the pipe is cracked into the cement. We are getting sewer smells from it and want to redo the poor cap job and fix the crack. The pipe just crumbles when you put any pressure on it. In the episode the guys put a smaller diameter pipe inside the cast iron past the crack. Then a larger diameter piece of pvc outside the pipe. They attached the outside piece to the cast iron and the smaller pvc and the capped the smaller pvc. I remember the concept but need to see clip again for execution. With out the clip any tips on excution would be great.