I'm renovating my kitchen and I'm having to move my sink/drain lines a foot to the left. I have two drain pipes that come out of the wall under the cabinet. The pipe on the bottom drained the sink. The pipe on the top was nothing but a p trap with a pvc piece at the top with a dishwasher drain inlet and then a vent looking thing above that. From here the two drain lines run along the wall and then drop down into the crawl space, somewhere in the wall there's a y where they connect.
My question is, what is the top pipe for and what should I do with it? I'm going to guess its being used to vent this side of the drain system since it's the highest point on this "branch". The new sink is a single basin and I'll have a garbage disposal so I'm planning on connecting the dishwasher to the disposal (hanging the drain line at the top of the cabinet).
My question is, what is the top pipe for and what should I do with it? I'm going to guess its being used to vent this side of the drain system since it's the highest point on this "branch". The new sink is a single basin and I'll have a garbage disposal so I'm planning on connecting the dishwasher to the disposal (hanging the drain line at the top of the cabinet).