How much can a 3 inch drain tolerate?

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Mchiarit

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I am doing some remodeling. I currently have two bathtubs, a shower, three toilets and three sinks draining to one three inch (3.5" O.D.) main pvc drain pipe. I plan to add a shower and a sink. Is this a problem?
 

Plumguy

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Three toilets is the max on three inch. As long as you don't add another toilet you are fine.
 

Mchiarit

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Another question

Thanks plumguy.
Just out of curiosity, what is the max permitted toilets for four and six inch drains?
 

Plumguy

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Off the top of my head I think 4" you can have something like 48 toilets. I do stand to be corrected! As far as 6" I have no idea don't use it much!
 
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