Plumbing – What shape/bends should a bathroom sink drain pipe have to generally comply with US code and avoid clogs

bathroominteriorplumbingvanity

Santa Cruz, CA, USA

I think this question might be related to Under bathroom sink piping (exposed) but my question is more general so I decided to post it separately.

I'm in the middle of a bathroom remodel and getting ready to buy/build/connect parts for a sink drain assembly. Things are in the early stages so I don't have precise measurements of the vanity yet. What I'm wanting to know is:

  • Generally speaking, what should the recommended shape of drain pipe be?
  • If a "P" trap is recommended, where should it be located in relation to the height drain outlet on the wall?
  • Aside from a "P" trap, is there any other specific drain pieces that are recommended?

Here's a picture of the wall (outlet pipe is a 1.5 inch iron pipe).

wall where drain is

Best Answer

You should be able to find a P-trap assembly available at any local hardware store.

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The horizontal section should attach directly to the drain line coming out of the wall, while the vertical end should accept the tail piece from the sink.

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