How to Plumb for a Double Sink

Written by joey pellham
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Installing plumbing for a double sink installation can be easy to do, as long as you have the basic plumbing skills and extra parts. You will need to know about the different kits available at your local hardware store because they may contain different connection pieces. For example, a kitchen double sink may have a dishwasher or disposal, but a bathroom sink would not. It's a good idea to purchase a few extra nuts and compression washers, just in case you misplace any.

Skill level:

Things you need

  • Towels
  • Buckets
  • 2 supply lines
  • Lubricating spray
  • Double sink PVC plumbing kit
  • Plumbing wrench
  • Hacksaw
  • Screwdrivers

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  1. 1

    Locate your main plumbing drain. Hardware stores generally sell two types of PVC kits used for double sink installs. One is for a centre drain design, while the other is for a drain located to either side of the sink. Buy the kit that works for your drain set-up. You will also need two new supply lines. Take the old one to the hardware store to match up the size.

  2. 2

    Set out all the parts in your kit on the ground. This way you get an idea of what it will look like when put together. Shut off your main water. Place towels and buckets out to catch any water that may leak. Remove your supply lines with your plumbing wrench. Use lubricating spray for stubborn connections.

  3. 3

    Install the new supply lines with your wrench. Look at the picture on the package for your PVC double sink kit. It will show you roughly how to lay out your parts. For a centre-set sink, you will have a p-trap, tee section, and two straight pieces of PVC plumbing that goes both on the left and right sides of the tee. These two straight connections will lead directly to your sink's two drains. Garbage disposals will also hook up with a straight PVC tube. Dishwashers will require their own tee connection. Check with your local plumbing contractor if you need help.

    End connection kits will contain a P-trap, wall tube, and a straight PVC pipe that runs horizontally, and one that will run vertically down from the sink drain. Again, look at the pictures on the PVC kit bags. They will show you a diagram of all enclosed parts.

  4. 4

    Dry-fit together all pieces and then make any necessary cuts with your hacksaw. PVC plumbing is connected by using plastic nuts and compression washers. Don't use plumber's putty or silicone. You want to take apart the joints easily for any repairs.

  5. 5

    Slide each nut onto the PVC piping. Slide the washer onto the PVC piping, then tighten down the nut and washer onto the male-threaded portion of the PVC pipe. The procedure is repeated for each joint. Hand-tighten, then slightly tighten with your wrench. Turn your water back on and check for any leaks.

Tips and warnings

  • Under-sink plumbing can greatly vary from one sink to another. Look at what you have now. Take pictures with you digital camera. That way, when you go into the hardware store, the salesperson will have something to go on.
  • Codes will vary. Consult your local plumbing contractor or inspector for exact details on how to properly plumb your double sink..

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