Many people like the convenience of having a double kitchen sink. They can wash dishes in one side and prepare food in the other at the same time. Although the sink size is doubled, they are still fairly easy items to install.
You just have to have the extra room. The problem comes in when you go to plumb them. Although there is still only one faucet, you still need to install two drain assemblies. It gets even more complicated if you have a dishwasher that uses the double sink drain lines too. In this article, I will talk a little more about double sink plumbing and how it’s done.
It definitely is tougher doing double kitchen sink plumbing than single sink plumbing even though they both only have a single drain. You have to add a drain assembly to the bottom of each sink before they ‘tee’ together to go down the single drain. That means you can run into more problems if you don’t do it right.
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You also have twice as many problems you can run into with a double sink setup. So that means you have to be very careful that you plumb, so there is no restrictions or clogging. There are also twice as many places that can leak with a double sink drain setup.
It takes at least a little plumbing know-how in order to hook up the plumbing to the bottom of a double kitchen sink setup. With that said, it’s not something that is extremely difficult. So definitely don’t be intimidated before you start doing this project.
Remember, you are only dealing with one main drain and to somewhat short sink drain assemblies. Really the only thing that is different between a double and single sink setup is the two drain assemblies and the ‘tee’ fitting that connects them to the main drain.
Keeney Double Bowl Kitchen Sink End Outlet Installation Kit
Once you have the sink in place, assemble all of the tools and other provisions, you will need to do the job.
We will be using PVC fittings that have male threaded and female slip ends on them. The female ends will also have a seal and pipe connector on them. There is no gluing involved in this project in most cases. You will need a pair of channel locks to tighten connections. You will also need Teflon tape to seal the threads on the pipe connections.
Next, I like to lay the parts out in front of me and kind of duplicate the way I feel they should go together under the sink. This lets me know I have all of the parts I need before I start the project.
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Start by connecting an elbow with a long straight end onto one of the sink drain spouts. (On all pipe threads use a single wrap of Teflon tape to help make a good seal.)
Next, put the end of the pipe that is not connected onto the sink spout into one of the short ends of the ‘tee’ fitting. Again, do not tighten it all of the way.
Now, repeat steps 3 & 4 with the other side of the sink. You should then have both of the sink drain spouts plumbed into both short ends of the ‘tee’ fitting.
How To Install A Double Kitchen Sink Plumbing
The final step is connecting the plumbing from the trap to the main drain line. Once this is done, tighten all of the connections with the channel. Only use light pressure, or you will break them.
Some of you may be wondering how to plumb a dishwasher drain line into this setup. I often get asked if you need to add a third drain assembly into the mix. That’s not the case at all. It’s much simpler to set up a dishwasher drain line that.
Most likely, you have never seen water drain out of a dishwasher because their drain lines are usually hidden and fully enclosed. Dishwashers do not use as much water as you think. Because of that, they don’t need very large drain lines. Dishwasher drain lines don’t normally have to be any bigger than ¾”.
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So, most plumbers simply use a ‘tee’ fitting cut into one of the two double sink drain lines to empty their wastewater into. It’s a very simple setup even if you are doing it as part of a retrofit. You must also be aware that if you have a garbage disposal, many times the manufacturer will include a connection that makes it simple to hook the dishwasher drain into it.
Josh Hurd has been freelance writing since 2006. He attended the University of Akron, graduating with a Master of Fine Arts in creative writing.Whether you’re putting in a new sink or simply replacing old piping, ’s catalogue contains all the necessary tubular piping for any type of plumbing scenario. Piping comes in plastic, brass and semi-cast material; although, any type of pipe material can be combined with another. Tubular also comes with and without a cleanout--a fitting that is used to easily access plumbing for cleaning without having to remove the entire fixture. Piping also comes in different diameters, including 1-½ in. (suited for kitchens and laundry rooms) and 1-¼ in. (typically suited for bathrooms).
Note: This guide concerns the application of typical bathroom piping set-ups from under the sink to the wall. All tubing will typically need to be 1-1/4 in. in diameter but check your wall connection.
Installing A Double Sink ?
Install Pop-Up Drain(s) Determine What Type of Setup You Have Attach First Slip Joint Waste Arms Attach the Center Outlet Tee Apply Flexible or Standard Extension (IF OFFSET) Measure & Cut Wall Tube Install Wall Tube Install J-Bend Check for Leaks Measure & Cut Floor Tube Install Floor Tube Install J-Bend Check for Leaks Document Downloads
This guide assumes that you have already purchased your sink bowl(s) and have existing wall plumbing in place. Regardless of location, all sink plumbing will connect to a drain in the sink bowl. For bathrooms, we recommend pop-up drains, which can be installed according to these instructions.
There are many different types of under sink set ups. For instance, the typical plumbing set up has a pipe going straight from the sink into the wall. Sometimes, however, the wall outlet can be offset, requiring a flexible extension tube. In cases where the plumbing outlet is in the floor, such as in an historical home, further plumbing attachments will be needed.
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Slide the nut onto the tailpiece before applying the washer underneath it with the beveled side facing down. Hold the first waste arm onto the tailpiece and screw the nut down onto the arm over the washer.
Next, determine where the waste arm will connect to the tee to determine where to cut. Measure from the center of tailpiece to the tee inlet, then cut the waste arm at that measurement.
Note: Measuring and cutting the pipe to the correct length is usually necessary, as it rarely matches the exact size of the waste arm.
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Next, attach the outlet tee by sliding the nut and washer onto the end of the first waste arm (with the beveled side of the washer facing outwards again), then screw them into the outlet tee connection. Repeat these steps with the second waste arm.
Once you have assembled the slip joint arms into the center point T junction you are ready to connect the piping to the waste outlet.
If your wall outlet is not directly in line with your tailpiece, it may be offset. This will require you to install a Form N Fit piece to bridge the gap between the end of the tailpiece and the J-bend.
Better Undersink Plumbing
Start by placing the Form N Fit onto the tailpiece by sliding a slip joint nut onto the tailpiece and holding it in place as you slide a washer on underneath it. Hold the Form N Fit up onto the tailpiece and screw the other slip joint nut on top of washer at the tailpiece to J-bend connection.
Measure the required length of the wall tube by holding the J-bend onto the tailpiece and measuring the distance from the wall tube outlet to the end of the J-bend. Mark your wall tube at the distance measured and cut the tube at the mark with a pipe cutter. Remove the J-bend, for you will not be installing it yet.
Place nuts and washer on wall tube in order of smallest nut first, then larger nuts (slip joint nut, trap adapter nut) and finally the washer on top. When the tube is inserted into the wall outlet, the larger nut should be screwed over the washer at the connection between tube and outlet, while the smaller nut hangs over the other end of the tube where the J-bend will connect.
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Slide the slip joint nut onto the tailpiece and hold it in place as you slide a washer on underneath it. Slide the J-bend up onto the tailpiece and screw the slip joint nut on top of the washer at the tailpiece to J-bend connection. At the other end, screw the slip joint nut from the wall tube onto the J-bend to wall tube connection.
Place a tray underneath the pipes
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