We've had a new extension added to the house which has a drain under the concrete. We're left with a 110mm (I think) vertical pipe which our waste needs to go down inside the extension.
This waste is only for the sink and dishwasher. Toilet and bathrooms go down a waste pipe at the other end of the house and meet on the main sewer pipe which was sorted by the builders.
- How do I leave the connection between the 40mm from the sink to the 110mm?
- Do I just drop some of the 40mm inside the 110mm pipe so that it can drain away?
- Does the connection need to be blocked off with a rubber seal to stop smells?
- I assume if I do need to seal it up that I'll need to have a T joint or similar above so that it can be unblocked if necessary.