What size piping for a toilet stack?

E

Effie

Registered User
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135
MY old cast iron toilet stack needs replacing and the plumber is suggesting a 4 inch pipe but I think that the cast iron one was bigger than that.

Can anyone advise me as to what would be the best size to get? It will be servicing 2 toilets and I want to get most of the house sink drains to go into it as well.

All advice much appreciated
 
It's the internal diameter you should be looking at; 4" is correct.
 
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