Thanks for the replies guys
As I mentioned there's two of them - the top one had a 32mm waste pipe slotted into it, the lower one, 40mm.
I decided to put both the sink and bath waste into the 40mm and cap off the 32mm, so I removed...
I have no idea what you mean by socket.
The part sticking out is cast iron - there's a hole into the main pipe at the back which is pretty rusty - don't know if that's just from here, or rust from higher up the pipe collecting in the...
Collars are irrelevant really - one below is just like the one in shot - there's another boss just below. I can't touch the pipe itself as it's a shared pipe in a block of flats.
Looks like both were welded to the pipe when the...
There is no male iron and no plastic in sight.
The bosses are built into the main soil pipe - the rubber adaptors are pushed in.
This is a 50's build.
Photo attached - it has a 40mm cap shoved in at the moment.
I'm working with an old cast iron stack that has two cast iron bosses built into it.
Currently one has a 40mm waste pipe going in, the other 32.
Thing is they're both 50mm in external diameter and deep. I can only find boss adaptors...