CPI Supply sold and installed the first slip lining project for INDOT on I-64 about 15 years ago. Since then the slip lining industry has exploded and it is the major solution to rehab deteriorated pipes under major roads. Slip line H.D.P.E. pipes come in sizes from 10” to 120” in both round and ovaled. CPI was also the first to offer ovaled H.D.P.E. pipe. Click this link to view promo video.