Can I install a sink trap on the vent stack for a bathroom in the next room?

garage_greg

I hope you can take a look at the drawing and let me know if its ok to hook up the waste like this. The plan is to remove a section of galvanized steel pipe at both locations in red and install a PVC sanitary tee and attach with 1-1/2" Fernco Proflex couplings. The existing sink drain that will be removed is @ 14" center. The 2 new drains will be @ 22" center to get up inside the vanity. New traps not shown.

Originally asked by Randy M on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

You show a trap for the laundry, so you need a trap for both sinks and the shower, if you don't fit them then you could / will end up with smells coming in...

Full answer by Solar Mike: https://diy.stackexchange.com/a/161889 (CC BY-SA 4.0).

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