Recent content by fretless

Thanks for replying. I'm amazed that they weren't vented. The house isn't that old. Looking at the picture, does it matter if the washing machine vent is above or below the backflow preventer?

I am getting ready to replace my utility tub, and I would like to correct the plumbing problem while I do it. When the kitchen sink upstairs is running, the utility tub gurgles sometimes. The kitchen sink drains horizontally before dropping vertically to the basement where the washing machine...