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Still_Willow2252 t1_j85bu4l wrote

Better off not putting in an s trap at all. Look up air admittance valve and follow directions for doing it right.

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SlightlyPoached t1_j85fabe wrote

You very much do not want an s trap. They act as siphons, sucking the water that is supposed to act as a seal for sewer gasses etc down the pipes.

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mookmook1 OP t1_j85i7e7 wrote

Thank you both. I’m going to Home Depot to get the air admittance valve and going to install that with a p trap. Much appreciated!

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browntoe98 t1_j863wd6 wrote

I’m in the same situation. My expert recommended checking local code as AAV are not universally accepted. (Just fyi.)

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5degreenegativerake t1_j878uox wrote

S traps are specifically prohibited by international plumbing code so you are no worse off code wise and much better off real world wise with a P trap and AAV.

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