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Thanks for the update, notice any issues since you have been living with this install?

I know this is an old thread but had a couple questions related to this exact thing I found while doing an internet search. 1) why is a 2" drain required if the value of each lavatory is only 1 unit and an 1 1/2" pipe can serve a value of 2 units? Please specify where I can find this is in the...