Soil stack queries



I am adding a new bathroom to our house and also moving the toilet in our current bathroom. So i will be adding a new section of soil stack. Can anyone answer these queries:

1) Do i use this bend coming out of the wall for both outlets or do i use one which has 2 socket ends to it.

2) is this the correct branch to use

and can i run my boiler drain into the boss area ?

Also i have a cast iron stack at the top of my stck still going through the roof (up through eaves section). I want to leave this as it will cause more problems taking it out. will it be ok to just cut the stack where my new branch will go in
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You'd need to give us more detail mate of what you are trying to do. Is it a single stack SVP, in other words; does the waste & WC soil pipe go into the one cast iron SVP?

A fag pocket sketch always helps, perhaps you could up-load that?
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