CIPP has become the industry standard for relining pipes, but it’s not a perfect solution. CIPP liners often shrink after curing in response to variations between cure and ambient temperature. The annular space between the liner and host pipe can allow ongoing infiltration, becoming a groundwater expressway that carries leakage directly from the source to the manhole. While closely monitoring the cooldown process and lowering the temperature before releasing pressure can help prevent shrinkage, it can also add time and expense to an already pricey repair process. To prevent this, many installers utilize a liner end seal.