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Drain vent configuration for a basement shower
I have a basement shower that does not drain quickly enough, and I am guessing it is due to my vent configuration.
The shower uses 2" plastic piping with trap, which then connects to 1 1/2" copper piping. That pipe connects to another copper pipe which is connected to the kitchen and laundry on the incoming end, and connects directly to the main stack. The vent is connected to that pipe, plus an additional pipe on the stack.
Hopefully the diagram attached explains the configuration.
I have heard the 1 1/2" is enough for a full pressure shower, so that leads me to believe the issue is either with venting, or with my drain being clogged. Does the venting look correct in the diagram?