Can a 2" DWV WC vent also be used to vent a 1-1/2" basin drain?

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bergmanj

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Folks,

Brand new poster here.

Spouse and I are building a new retirement residence.

I'm doing the DWV work.

Can a 2" DWV WC vent (PVC - all the way to attic vent manifold) also be used to vent a 1-1/2" basin drain (combined into from basin 6+ inches above basin flood rim)? Or, must the basin vent be run seperately to the attic vent manifold (4")?

Regards, JLB
 

MACPLUMB

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Yes it can !

dwv_b2.jpg


Two bathroom groups with one 2" vent
 
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