PVC Liner
T-Lock® is a T-ribbed polyvinyl chloride sheet lining material designed specifically to protect new concrete trunk sewers, interceptors, manholes, structures, and monolithic tunnels against hydrogen sulfide gas, acids, alkalis, salt, and other forms of corrosion. Manufactured from high-molecular-weight vinyl chloride resins that are extruded under high temperature and pressure, T-Lock provides a dense, impervious, and continuous plastic lining. Applied during concrete casting, concrete flows around the molded T-ribs and permanently locks the liner into place as a part of the substrate.
Northwest Pipe Company, https://www.nwpipe.com/product/t-lock