Liner - 4" Flex Liner 4.5mm

The Perma-Liner 3mm Flex Liner is a high-performance, flexible felt liner engineered for small-diameter CIPP rehabilitation. Designed for use with air or water inversion systems, this liner delivers the strength, flexibility, and resin compatibility professional installers depend on. Its 3mm wall thickness provides a perfect balance between structural performance and ease of inversion—ideal for 2"–8" lateral rehabilitation projects.