I had a new counter and sink installed recently and I noticed that the trap was an S-trap. I am trying to replace it with a P-trap and add an AAV.

[David B.]

I am trying to change an old s-trap to a p-trap with an AAV. The 1.5 inch pvc drain pipe comes up through the bottom of the cabinet. It is almost in line with the right basin tailpiece, but about 3.5 inches to the right. There is no room to attach the p-trap pieces without adding two 90 deg elbows. I am using slip joint pvc parts back to the sanitary T /vertical drain pipe. I reversed the location of the p-trap to be under the left basin tailpiece and that seems to work better. Here is a photo of the mockup. Will this configuration work and is it legal? I also offset the pipe for the AAV to clear the sink.