Sewer issues again today

Another Monday morning and another drainage issue resolved. The branch to the top right of this junction lead off to a new build that had yet to be finished. In the meantime, rats had found that the far end of the pipe was open and were making full use of this, turning the garage into a nice home for themselves.
Here you can see the ‘bung’ we’ve fitted. This is a removable plug that seals the branch off and stops the rats from getting into the pipe from the sewer end. Sealing up the far end would leave a long empty tunnel that could be used as a nest site and not fully solve the problem.
Drain bung installed