Basement Bathroom Group

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Building a new home and want to make sure I have the DWV correct for the basement bathroom group. (not a professional)
See Attached Image
What should be changed?
Does the WC need a vent?
Any issues 1/8" pitch on the 3" PVC? - it's a long run. I might be able to do a bit more pitch but 1/4" would be tough.
I know 2" is oversized for the vanity sink. Just trying to reduce fittings since I don't do this every day.
Only a couple of floor drains connect to the 3" PVC once it gets to the mechanical room.
Should I add a backflow preventer to the 3" PCV just before the sewage basket?

Any feedback is greatly welcomed.


  • Basement Batroom Group Isometric.pdf
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