Cast iron pipes

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Aaplzen

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Hello All,

I'm gonna replace cast iron drain pipes under crawlspace. Should I use 3 or 4 inch PVC? Thanks in advance for all your advice.
 

Aaplzen

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Either is ok normaly 3 " is fine. 3 w/c's max
Thanks for replying Jeff, but which one would you use? I'm gonna be hiring a plumber for this, so I asked around. I'm getting differing opinions. I don't wanna make a mistake with something big like this.
 

Jeff H Young

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up to 3 toilets 3 inch is fine I do whole houses with 3 inch. it wouldnt be wrong or substandard at all. actualy unusual to run 4 inch on a single family home.
 
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