Connections to soil stack

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Hampshire
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Hi All,

Can anyone advise me if there is a minimum distance between multiple boss connections into the soil stack where they all enter the stack on one side?

I want to connect 2 x 40mm (1 x 40mm for double kitchen sink and 1 x 40mm for dishwasher) and 1 x 32mm (for hand wash basin) waste pipes, one above the other, into one side of a 110mm soil stack.

Does any manufacturer make a boss pipe that would suit or should I use 3 off strap-on bosses?

Kind regards.
 
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Does any manufacturer make a boss pipe that would suit or should I use 3 off strap-on bosses?.

Cut the stack and insert a manifold. You might need a slip coupling above it if you don't have any slack on the pipe. With that all your wastes will go in at the same point and there are then no dimension restrictions. Eg screwfix item 22367.
 

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