Is the second pipe the soil vent?

[JP_]

I'll ask my builder in the morning, but curious now!
Is the second pipe that is closed off at the moment for the soil stack vent? I assume so. These are for the new kitchen but connect with the WC too.

Main drain top - what is the lower thing? Vent?

existing WC top, new kitchen sink bottom:

 

[Ian H]

Vent or soil stack.

Maybe even rainwater, some people use a rest bend instead of a gully on rainwater downpipes.

 

[^woody^]

That layout looks a bit crap.

A bend, then a junction, then a manhole? WTF?
And is that a backfall or the camera lens distortion?

And if that is a soil stack, then it looks like its got the wrong bend on the bottom - not a rest bend. Also looks like effluent flushed down the soil pipe will suck the trap out of that gully.

 

[Ian H]

Also looks like effluent flushed down the soil pipe will suck the trap out of that gully.

Only if a bird builds a nest on top of the stack and Jonbey does a perfect 110mm diameter turd.

 

[JP_]

well, the loo pipes run the same way they have for a long time, old cracked clay pipes just replaced. That sticky up bit is just a for the vent.

 

[Nige F]

I reckon it's to stop the digger running away - a chock