Partial block in toilet.

[Ch4 plumbing]

Does the soil vent to outside or is it a stub stack with an AAV? (Boxing for soil stack about 800mm high next to pan)

 

[peter lanky]

It doesn't go directly to outside. The house was built with all the soil pipes internal behind plasterboard. I've no idea what happens when the waste pipe passes through the wall.

 

[Howsie]

Well the next step is to take the WC off as most of the time you can see the Mr Hanky blocking it.