Hello. I would like to add a bar sink in my basement. It is by an existing stack that is only connected to the kitchen sink and also in the vent. See pictures. Red is the existing.
Should I extend the stack and drain the sink and connect the vent as in the first picture or just tie into the existing sink drain and vent as in the second picture. Or something different (ie: cheater valve)
the stack can be used, its called wet venting, highly unlikely you will get issues with a little bar sink at the location you specified, other option is a cheater vent under sink in the cabinet. If you are pulling permit it will not pass but really it will work otherwise. Normal venting to code means running line all the way through house past last fixture draining into the main stack or separate vent out of roof, very costly if you are in a basement
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