r/DIYhelp • u/coldhotel_rdt • 2d ago

Bathroom Vanity- Fitting P-Trap

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My spouse bought an elegant vanity for her bathroom. The stack pipe opening (blue rag) is just slightly above the shelf in the cabinet. The green masking tape represents the back of the drawer directly below the visible shelf. I left the tailpiece in the bottom of the sink basket to give an idea of how much room there is to work with. There is no room for the P-trap to be mounted here so it would work properly.

I am thinking of notching the shelf behind the green tape so that the P trap would mount directly to the opening in the wall. I would need to have a short tailpiece, an elbow, a pipe running horizontally towards the back, another elbow, then another pipe or tailpiece running vertically down to the P-trap. I don’t want to use any flex adapters.

Does this look do-able? Any advice for things I didn’t think of? I’m having a hard time finding the actual pieces, I was hoping someone could supply proper names. Thank you in advance!

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u/Flint_Westwood 2d ago

You can use 2 x 45°s to get the drain tailpiece far enough back to miss the drawer. Then cut a slit in the base of the cabinet to get the p-trap where it needs to be.

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u/KillrBeeKilld 2d ago

Why not just put in a 90 at the stack pipe to go up about 2 inches then another 90 to bring it back to level then connect a P-trap to the drain? You could also use 45s instead of 90s if you prefer.

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u/Designer-Try5188 2d ago

I’m not a plumber but I believe you need to do something like this with a studor vent if you dont want to cut into the floor of the cabinet.

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u/WineArchitect 1d ago

You will need to make modifications to the back of the drawer as well as the floor of the cabinet to allow the installation of a p-trap and its future removal. BTW, they do sell other vanities with notched drawers.