Originally called “insitu form,” meaning “form in place,” cured-in-place pipe (CIPP) liners were developed in 1971 by Eric Wood in London, England. Prior to that, trenchless technology methods were limited to sliplining or grouting techniques. But those methods were less feasible: grout is a short-lived solution that is expensive to apply, and sliplining also requires grouting, a measure of trenching and results in significant diameter loss. Wood recognized the opportunity to improve rehabilitation efforts with liners that were cured directly inside the pipe, which led to the invention of CIPP liners. CIPP repairs the damaged pipe with a liner that, essentially, becomes a new, jointless pipe within a pipe. Wood successfully executed the first CIPP repair by pulling a felt liner impregnated with polyester resin through the pipe and finishing it with an ambient cure.