I have been a NuFlow Contractors for 7 years here in Seattle Wa. I has been a great product to work with. Our product can be installed from a cleanout and not cut off the wye. We can push or pull our product from a open pipe or cleanout directly to the problem area (lets say 40' downstream) and install a 10' liner only where the problem area is, saving the customer time and money. Not to mention making my company look like hero's because the other lining companies cannot do what our product does...In a word Superior.