How to Plumb a Double Kitchen Sink with Disposal and Dishwasher

  • By: Peter Allen
  • Date: 06/23/2021
  • Time to read: 6 min.

Want to plumb a double kitchen sink with disposal and dishwasher, but don’t know how to do it? It’s okay. Don’t get frustrated. This job can be a piece of cake for you once you learn the process from any professional plumber. 

Needless to say, I’m a professional plumber. I have been doing the job over the last 2 decades. For this reason, I know very well how to plumb a double kitchen sink with disposal and dishwasher.  

In this blog post, I’m going to write down my real life experience what you also need to know. So continue reading this article to easily plumb your double kitchen sink by yourself. 

10 Steps To Install Garbage Disposal:

Install Garbage Disposal

Before installing a garbage disposal, make sure to acquaint yourself with all the parts of the disposal. Otherwise, it would be difficult for you to understand. So follow these simple steps:

1. Plumber Putty: 

Take plumber putty and apply it to the flange. Then hold and press lightly to hold up everything in a place.

Plumber putty is used for replacing plumbing fixtures and they are used to prevent leaks in any kind of plumbing work.

2. Flange Movement: 

To prevent the flange from moving, set the garbage disposal on the collar.

Flange holds things strongly so it doesn’t fall apart.

3. Place Everything In Collar:

Pile up the flange, fiber gasket along with the mounting ring.

Then slide everything lightly into the underside of the collar to assemble things before setting.

4. Snap Rings:

After everything’s in its place, you need to install the snap ring tightly with the screws. 

It helps place everything correctly.

5. Clean-Up: 

Clean excess plumber’s putty with a rag or an old piece of cloth. Also, materials that will no longer be used should be separated.

6. Electrical Cord:

For accessing the electrical cord, remove the wire cover plate first. Then match the color of the wires and connect it rightly. Reattach the wire cover plate after the wire colors are connected.

You can wire them in one way or two ways directly in a circuit.

7. Drain Plug: 

Make sure to remove the drain plug with a hammer. Otherwise, it can open up.

8. Discharge Outlet:

In the discharge outlet, insert the gasket with a gentle touch by connecting the drain.

Make sure you attach the discharge tube with bolts and flange.

9. Mount Ring:

Aligning the mounting ring hangs the disposal with three tabs. And to lock the tabs use the hex wrench. 

It’s necessary to lock tabs, otherwise, it will fall apart in the mounting ring.

 10. Connection of Dishwasher:

Connect the dishwasher drain and the discharge pipe to finish the installation.

Tip: Before the connection of the drainpipe, make sure you check out if the discharge pipe is arranged properly in a line.

Garbage Disposal And Dishwasher: Here Is What You Should Know 

Using the garbage disposal and dishwasher together at the sink is recommended by any plumbers. Plus, it’s very easy to handle kitchen waste by using garbage disposal because it shreds food waste into little pieces, which are then easily passed by plumbing.

You can use the dishwasher if a garbage disposal is broken. But you have to make sure any kind of food waste does not go through it. If food waste goes through it, it can clog your sink disposal. Thereby, your dishwasher will not vent efficiently. 

6 Common Tools That Are Needed  To Install Garbage Disposal :

Before installing the plumb, you need some common tools at hands, such as: 

  • Hacksaw
  • Hammer piles
  • Hex wrench
  • Screwdriver 
  • Plumbers putty
  • A rag or an old piece of cloth

10 Easy Steps To Install Dishwasher:

Install Dishwasher

Keep on following these 12 steps very carefully. Otherwise, you won’t be able to install a functioning dishwasher. 

1. Turn off water supply:

Before starting the installation process, you need to turn off the water supply.

If you don’t turn off the water supply then water will spread out everywhere while working.

2. Unplug Garbage Disposal: 

From the electrical outlet, unplug the garbage disposal at first. 

As garbage disposal is connected with an electrical cord, so working without unplugging garbage disposal is dangerous.

3. Remove Knockout Plug: 

Using a screwdriver and light hammer, find and remove the knockout plug.

4. Remove Hose Nozzle: 

Try to remove it by losing both ways of a hose. Then unscrew the hose nozzle by turning clockwise.

Then Use a needle nose plier to remove the hose nozzle.

5. Fit Washer:

Softly fit a thread above the air gap fitting up to the hole that is at the back of the sink.

Tight the runner washer at the trim cap by using hands.

6. Fit Angle Nozzle:

Keep rotating air gap fitting using hands until the angled nozzle is at the direction of garbage disposal.

Gently slide one side of the disposal drain towards the nozzle of the dishwasher. 

7. Hose Clamps:

Fix the hose clamps that are at the end of the hose. Tight the lower hose clamps with a screwdriver.

8. Check Hose Properly: 

Cut the upper side of the hose perfectly by using a utility knife. Make sure it perfectly fits the air gap nozzle.

9. Tight The Vertical Nozzle: 

Take a 1-inch hose clamp to insert it on another side of the hose clamp and ensure the hose doesn’t bend at the vertical nozzle.

 10. Installing Dishwasher:

At last tight the vertical nozzle with a hose clamp after the inserting.

Then your whole dishwasher will be installed.

7 Common Tools that are Needed to Install Dishwasher :

You should keep these seven common tools near you. The tools that are needed are: 

  • Air gap fitting
  • Light hammer
  • Screwdriver 
  •  Compression clamps 
  • One inch hose clamp
  • Utility knife
  • Needle-nose plier

How Many Hours Do You Need to Fully Complete the Job?

Plumbing the kitchen sink is easy but it requires a lot of time. To finish installing garbage disposal and dishwasher at the same time requires at least a couple of hours. According to skill level, some might finish it earlier and some take more time.

 I am making a chart below so you could understand exactly how much time is needed according to skill level.

Level Of SkillHour
Very first time4 to 8 hours
Amateur2 to 5 hours
Professional1 to 4 hours 

Can You Use the Same Circuit for the Garbage Disposal and the Dishwasher? 

You can use the same circuit for both the garbage disposal and the dishwasher. But to do this, you have to use a 20-amp circuit. And the total amperage of both shouldn’t exceed over 80 percent.

Note: Make sure there is nothing below the sink so that you can easily do your work without any issue. Because It can create hassles during the installation process if there are unnecessary items.

Can A Sink And A Shower Share The Same Drain? 

A sink and a shower can share the same drain if both of their drains are within five feet fixtures. If they are apart more than five, it would be impossible to share the same drain.

Can You Run The Dishwasher If The Rubbish Disposal Is Clogged?

You can run the dishwasher if the rubbish disposal is clogged. But you can’t throw any trash along it. Because the dishwasher and Garbage disposal depends on each other on a double kitchen sink. 

Can You Use A Plunger In The Kitchen With Garbage Disposal?

You can use a plunger in the kitchen with garbage disposal if you can’t remove a clog from the disposal. Because the plunger will help you remove the clog from garbage disposal easily by putting pressure.

Can You Attach Two Sinks To At Least One Drain?

Usually, you can hook up two sinks to at least one drain by adapting supply and drain pipes. But you may have to drain each of the sinks separately. It also depends on the code of the local plumbing. 

Which Side Is The Garbage Disposal And Dishwasher On A Double Sink?

Usually, the garbage disposal is at the right of the sink. And the dishwasher is on the left side of the sink. When the dish drain is used, it will be on the right of the sink.

Final Verdict:

It’s easy to plumb a double kitchen sink with disposal and dishwasher by following these easy 12 steps. For better understanding, you should see the manuscript that is given.

I hope that this article will help you to install a double kitchen sink with both of the kitchen appliances.

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