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hav it
can i run my sink and bath waste into one external pipe. Would this cause problems with water backing up in bath ect.
Ideally 2 seperate pipes (32mm basin, 40mm bath) but them joining somewhere lower down the run is fine. If you intend to run just a single pipe......40mm
H
hav it
is there a reducing kit i will need???
Just get a 40-32mm reducer...either solvent weld or pushfit depending on your preference and pipework
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hav it
will this look about right.
Yes.......but you will need to find a way to get into your cast stack....i assume its cast iron? you can core drill em and fit a 40mm spigot to them.....but probably not on the 'Y' section...lower down
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hav it
problem iv got is, iv not got much room due to a conservatory being fitted.
Whats wrong with bringing it in front of the stack...then down and then into the stack below the Y
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would this be ok.
Can't see a problem with that. 
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pmsl DO YOU KNOW WHAT IT IS YET. drawing was never my game..
looks fine.....get the right size bi metal hole saw and spigot......drill and fit......
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hav it
whats the best way to go into the stack. i.e connecting up.
Read number 3 in the plumbing tips.
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