Pipe Transitions Chicago. Many Chicago homes have underground pipes that transition from a 4” cast iron pipe in the house to a 6” clay pipe past the foundation. The Perma-Lateral lining system can be used on these pipe transitions to rehabilitate them for another 50+ years! The Perma-Lateral materials have a patent pending reinforced scrim which allows the liner to invert smoothly into the existing host pipe while preventing the liner from stretching into the main line. If you live in Chicago and would like to see a live demonstration on pipe transitions and the Perma-Lateral materials, please contact us to set the demo up!