Connecting 110mm pipe into a square gully

[regdorp]

I'm adding a 110mm stub stack and need to connect it to an existing square gully that has a 150mm grate. I'm not sure if there is an adapter etc to do this, would anyone know?

I assume the gully was originally outside, but it now part of an extension that I'm converting to habitable space as the easiest solution is the stub stack in the top of it (confirmed with building control etc). Just can't work out how to connect it.

All help gratefully received!

 

[regdorp]

This is what I can see from above.

I assume the gully is something like this (it is clay):

 

[Hugh Jaleak]

The stub stack needs a direct connection to the drain, you need to remove the gulley, and connect onto the outlet pipework. Building Control will permit a connection to the pipework, but I rather suspect they presumed the gulley would be removed first!