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Turning walking shower stall into bathtub/shower combo.
Question:
Current shower drain (2" pipe) runs 5 feet, under slab, to vent stack (5" cast iron vent pipe) of toilet. Will need to move the drain 3ft to wall for new tub.
After moving the drain, the complete length of the pipe will still be around 5 feet.
We will have to reduce the drain line at the trap to 1 1/2 in order to connect the tub drain/overflow. Do I need to add another vent?
Or is the main stack sufficient?
Attached Chicken Scratch sketch of system