Originally Posted By: jpeck
This post was automatically imported from our archived forum.
The AAVs that I’ve seen are required to be 4" above the weir of the trap, and that looks too low.
The horizontal line does look reverse sloped to me too.
The dishwasher drain line also does not (at least it is not likely to, based on the photo) have a high loop over the dishwasher as most require, thus, any backing up in the drain will likely backup into the dishwasher.
The dishwasher should also either enter through the side of a vertical tail piece (they make fittings just for that) or through a wye (not a sanitary tee) in the horizontal line, and the existing sanitary tee in the horizontal line should be a wye. Sanitary tees are made for use in vertical pipes, like the right one.
That's a good start, I think.