This is a new home. The plumber has done the rough in and it passed inspection.Now he can't make it back.I know how to do it all .but the kitchen sink because I have never seen 2 drain pipes. What is the second drain for the dishwasher, garbage desposel what ?

I need your help Boop63 Thank You

Hi Boop63

Usually all this connects into 1 pipe...

The garbage disposal connects to the sink and the dishwasher connects into the dishwasher connection at the side of the garbage disposal (knock out plug needs to be removed) and then all gets piped into a PTRAP that then gets connected onto the pipe coming out of the wall... see picture.

If you have two pipes coming out of the wall it is possible that in your area you need to connect the dishwasher indirectly. Here, indirectly means you would be required to install the dishwasher hose into its own PTRAP with a standpipe as tall as possible under the sink.

The two pipes, if one is through the floor and the other is through the wall, you could have a waste and vent pipe in which all the above connects into 1 ptrap as described with ptrap, but connects into a sanitary tee fitting that runs to the bottom pipe and runs to the top pipe...

Anyway, I could go on guessing. Plumbing codes differ quite a bit from state to state.

Best idea here is to either describe your set up in great detail, post a picture here so we can see it all, or call the local plumbing inspector and see what he requires to be done here.

We're glad to help if we can... :)

MARK

PS... the air gap fitting in the below picture may or may not be required in your area. In my area we don't use air gaps but instead use a simple high loop under the counter. You may want to discuss this with inspector as well. I'm wondering if you will be having a final inspection... if so best to get to know the inspector so you don't end up doing work that will need to be removed.

Is the sink in the island ?

Hi Boop63,

Mark have states very good, I am just adding the image below for information if it will help you, Thanks.

John

I am thinking Milo may be onto something here...

Hope to find out soon... ;)