Another question Im afraid in my never ending saga.
Under an extension to my house is a drain (approx fist size in diameter). It is from next door and is for normal domestic water and sewage. My drain joins it then it goes to the main sewer in the road.
Under my extension there is a branch off this drain at 90 degrees ( a "T" so to speak)
This branch is not used and has not been blocked properly, and is causing problems due to water etc going down it
Is it possible to put a sleeve or sheath down the inside of the pipe which would effectively seal off this branch (from rodents for example)?