I am introducing a pedestal sink into a small bathroom that previously had only a shower and toilet, and need to install a drain and water pipes through the floor or in the wall next to the shower.
Is it appropriate to run the sink drain into the shower drain outlet through a coupling in the shower drain pipe (PVC)? The two drains would be about five feet away from each other.
In my question, I should explain my concern that coupling the sink drain into the shower drain would not properly vent the sink drain. However, my own thinking is that, if you couple the sink drain pipe into the shower drain pipe above the p-trap, it will have the same effect as running the shower, and thus, the sink drain will be adequately vented.
Thanks for any feedback. Joe
