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I'm removing a sink that's draining to a 2" PVC stack. However, it appears that there might be another sink or shower connected to the same stack. (I live in a odd-ball house with 3 bedrooms and 14 sinks.) Is there a way of determining what else uses the same stack?

I was thinking of capping the stack and blowing a shopvac into the available opening and seeing which sink begins to gurgle. But maybe there's a better way to do it.

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    the shop vac may work .... if you can press your ear against the stack (or use a stethoscope), have someone dump water in the sink – jsotola Apr 2 '18 at 5:20
  • Shop vac could just blow out the nearest vent and not disturb any sinks. – JPhi1618 Apr 2 '18 at 15:44

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