waste size question

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JohnDavid

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Bath remodel about to be in progress.

I need to connect a waste vent from a sink ( 1 1/2") to the shower drain line (2"). Both lines will be vented prior to their connection. Under the UPC (San Jose, CA), can the waste line stay 2", or does it need to increase in size to a larger size at this connection on the way to the main waste line? Is so, what size is needed.

Thanks.
John
 
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Hey, wait a minute.

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