Water and waste coming through plasterboard?

[picasso]

The op is using plastic elbows concealed in the walls so I don't think "best practise" is much of a concern here.

 

[dilalio]

I always use full bore where I can.
No, it's not a must and I didn't say it was.
OP could have questioned me but he replied thus...

Thanks, yeah I just found this out this morning

 

[picasso]

I always use full bore where I can.

No problem that's good practise.

No, it's not a must and I didn't say it was.

Your absolutely right you didn't say either.

OP could have questioned me but he replied thus...

He is a diyer why would he question you?

 

[dilalio]

He is a diyer why would he question you?

Coz that's what he's on here doing in the first place