Soil stack queries

[marsaday]

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. http://www.screwfix.com/prods/70115/Plumbing/Soil-Vent/92-5-87-5-Bend-Single-Socket-Black-SP161

2) is this the correct branch to use http://www.screwfix.com/prods/29610/Plumbing/Soil-Vent/92-5-87-5-Branch-Black-SP190

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

 

[marsaday]

anyone ?

 

[DeltaT]

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?

 

[Fluffster]

Use bends and branch with an access cap.

Pete