Our customer had a recurring blockage in an inspection chamber. During Investigation we found a badly fractured section of 9” vitrified clay was catching paper and waste and causing the drain to back up. The benching below the inlet pipe was also not finished correctly and was adding to the issue. We custom installed a part liner as the pipe reduced to 6” and went to pvc half a metre downstream. We then built up the benching using rapid set cement. There was a rat flap already in-situ before our visit so this was re-installed afterwards.