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Just did my countertops and had new double sink installed. The new sink drains are not centered as before, but offset. The installers took out the old one before I could take a picture of setup. The old setup had the garbage disposal installed on the left side. With the plumbing that is in place now what will I need to get the two sinks up and running? I bought a new garbage disposal as well to install on the left side like before. Do I need major work done to get the plubming all sorted out or is this an easy fix with just extra pipes and some cutting and adjusting? If anyone can give me some feedback or diagram of how it should work for my situation that would be great. I'm attaching pictures of what I have right now. The new sink came with one drain assembly and one strainer. Please let me know what other parts I will need to complete the project.

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  • This is a pretty broad question... when routing the pipes, just keep in mind that water always has to move downwards. If you run into any specific issues, we can help. It looks like you have plenty of room to work, so you should be ok. – JPhi1618 Jan 22 at 21:36
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You'll want to mount your disposal so the outlet of the disposal can mate up with the pipe that's connected to the wall. It looks like it's currently positioned pretty close if you mount the disposal on the right. If you want it on the left then you'll probably need to shorten the pipe going into the wall and swing the trap around 180 degrees. The outlet of the disposal should point down and it will fit into the opening on the pipe that points up. The horizontal inlet that's on the pipe that's connected to the wall will conect to the pipe laying on the ground, the other end of that pipe will connect to the sink strainer.New trap layout

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  • What about the pipe that is for the dishwasher air gap (sitting on the right side)? I know the white part will be above the counter with the metal cap, but what about the other end of it that has the metal clamp? Does it hook up to the garbage disposal inlet? – JoeyDYI Jan 23 at 0:44
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    Yes, it hooks up to the garbage disposal inlet. Don't forget the inlet on the disposal probably has a knockout on it that you'll need to remove. – Platinum Goose Jan 23 at 2:46
  • Which of the two drain parts should I install on other side of sink..the drain assembly (right side) or strainer (left)? Does it matter or either one will work with the plumbing underneath? The garbage disposal will gave it's own drain ring/assembly I assume. Also I saw in another video that the outlet from the garbage disposal was connected to the side of T connection whereas the drain tailpiece was connected to the top of that T-tube. Does it make a difference? – JoeyDYI Jan 23 at 3:46
  • Either strainer should work. If you had a deep and a shallow sink bowl then maybe it would be easier to plumb the disposal into the side of the T. When you lay it out keep in mind that you don't want waste any space under the cabinet and have access to the shut off valves without having to remove any pipes. – Platinum Goose Jan 23 at 16:16
  • I visited my local Home Depot to get some materials to fix up the plumbing and the guy working in the plumbing department showed me a "Garbage Disposal Installation Kit". He informed me this had all the pieces I needed to install my garbage disposal and sink drain and dishwasher air gap. I just need to clear out the old tubes/pipes that was coming from the wall and start fresh. The old pipes that I had there were ABS, but this package is all white pipes. Is this Ok to use? Images are linked. imgur.com/iLHk0p4 imgur.com/l0FtAId – JoeyDYI Jan 24 at 0:37

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