A person called the other day and said they had someone clean their sewer but when they tried a bigger cutter the company said they have an offset pipe. So I come and run the camera down the sewer and this is what I see. A big mass of roots. So I run a 4" sharktooth and then an expanding cutter and run the camera in again . The plastic pipe goes up to a clay bell so the roots have about 3/4 X 2" cavity to hide in. At the connection you can see a rubber boot - must not have gotten the clamps tight enough.