With regard to reconnection to existing pipeline systems, DIN EN ISO 11296-4 requires that the method of sealing any residual annular space between the CIPP and the existing pipeline respectively entries and exits of manholes to stop infiltration under the maximum design ground water head shall be documented in the installation manual.

"The treatment of lateral connections should preferably prevent the cut edge of the composite becoming exposed to either the effluent in the pipe or to ground water." [ENISO11296-4:2011].