How To Plumb A Kitchen Sink With Disposal And Dishwasher

How To Plumb A Kitchen Sink With Disposal And Dishwasher

Nothing is more irritating than continuously dealing with food waste, as anyone who has ever worked in a kitchen knows. Let’s face it, no matter how old you are, picking up food leftovers by hand is an unpleasant experience.

However, if you don’t want your kitchen sink to become clogged, you’ll have to deal with the problem somehow. We will show you how to install a kitchen sink in this post.

Plumbing a sink correctly is critical, whether it’s a conventional farmhouse-style stainless steel sink or a modern double bowl sink with disposal and dishwasher for right-handed and left-handed persons.

Why Do You Need To Install The Disposal System?

One of the most common features in modern kitchens is garbage disposal beneath the sink. If you don’t already have one, you should be aware of all the advantages of doing so. To begin with, a garbage disposal can break up any food remnants that wind up in your sink and drain.

That’s why you will not only be able to complete your dishes faster, but you will also have less blockage. This is also a great thing to have if you care about being environmentally friendly.

If you can break up more food waste and flush it down the sink, it will be more easily disposed of through sewage, minimizing the amount of rubbish that ends up in landfills.

In addition, the more food you can put in your garbage disposal, the less food you will waste. That means attracting fewer mice and vermin to your residence in urban locations. Furthermore, in suburban areas, you won’t have to worry about wildlife being attracted to the smell of food waste and digging through your trash.

Steps To Install A Sink With Disposal

You’ll be relieved to learn that a dishwasher and garbage disposal may both be installed under a single kitchen sink. So, it won’t be too difficult with the double kitchen sink. Measure the size of the dishwasher and disposal of the space available under the sink. If it fits correctly, you can begin the installation process.

Needed Tools

  • Wrench
  • Hammer pliers
  • Hacksaw
  • Electric drill
  • Screwdriver

1) Remove The Previous Sink Pipe

The sink pipe drains your wastewater. The P-trap is the name given to it by most plumbers. You’ll need to locate the tailpiece to remove this old sink pipe. Remove it from the wall drain by rotating it counterclockwise.

You’ll need a pipe wrench if you’re dealing with metal pipes. If you have a strong hand, you can easily remove the plastic. All nuts were loosened, and the pipe was disconnected from any additional connections. The second phase of plumbing, a double kitchen sink with disposal and dishwasher, can begin.

2) Use A Suitable Plumber Putty

Apply the appropriate plumber putty on the flange and gently press it into place. To keep the disposal from moving, place it on the collar. Stack the backup flange, fiber gasket, and mounting ring on the bottom of the collar, then carefully slip it on.

Install the snap ring after it’s in position, then tighten the screws. Remember to clean up any extra putty.

3) Fit The Trapes Appropriately

All of the P-traps must be correctly positioned in their respective holes. You’ll have to trim them into the appropriate shape for this. Measure the diameter of the wye and cut it to fit appropriately within the wall drain.

The trap will be linked to the sink on one end and the wye on the other. They’ll both wind up in your dishwasher and garbage disposal devices. Make sure you measure everything before cutting; otherwise, it may not fit properly, requiring additional effort.

4) Install The Pipes

Previous putty and residue will be present. You’ll have to remove them and replace them with new putty. After that, place all of the pipes and flange for your dishwasher and disposal in the correct holes.

Reassemble the system by replacing the mounting ring and tightening all the nuts. Your dishwasher and disposal under the double kitchen sink are almost ready to start working for you.

5) Check Before Start Using

Instead of speculating, make sure you do some tests before using it. Start the dishwasher and garbage disposal, and look for any leaks. To function effectively, the bend of the p-traps must also be on the right track.

If everything appears to be in working order, you are finished with your plumbing. Under your double kitchen sink, you’re set to use your dishwasher and disposal. It is not easy to cover all of the details in a single article. Based on your level of commitment, the work is fairly simple. If you’re not sure you’re comfortable, don’t take any chances.

How To Avoid The Disposal Waste Being Backed Up Into The Dishwasher?

This is possible because a drain tube connects the disposal unit to the dishwasher. If your garbage disposal becomes clogged, the water may begin to flow in the reverse direction, ending up in your dishwasher.

Don’t worry; you can easily prevent and resolve this problem. It’s as simple as pouring boiling water down the garbage disposal drain once a week.


Because the garbage disposal has a specially designed outlet for dishwashers, connecting the dishwasher outlet to your home’s drainage is much easier once you’ve installed the garbage disposal.

It’s simple to connect your garbage disposal and dishwasher to your kitchen sink. All you have to do now is follow the basic and uncomplicated steps outlined above. Read the manufacturer’s instructions before beginning the installation process and follow them later.

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