How to install a garbage disposal

The garbage disposal unit is a must-have in every household!

One of the many hidden gems between useful tools which makes our lives much easier, but often underestimated until it gets broken or damaged, and we stay without benefits of using it. The garbage disposal unit is a modern household appliance that is used to easily get rid of organic waste that occurs during food preparation or after a meal. Fill the sink with various leftovers such as peeling vegetables and just press a button. The shredder begins to completely shred all the organic waste that you put into it, which then disappears from your kitchen by going through a standard kitchen drain installation. Is it really so easy?

It’s true, it can smell bad, and it can break often, but on the other hand, without magic disposal, washing dishes would be an even worse nightmare than already is, and with time, pipes from your sink would be choked with rests of food and dirt from everyday use. That’s why it is very important to properly maintain and clean your garbage disposal from time to time.

It is also important to use it on a regular basis and to apply some tips and tricks, so your garbage disposal can last as long as possible. In other articles on our blog, you can inform yourself what kind of garbage can be thrown in a garbage disposal, how often should be cleaned and maintained and how does a garbage disposal work at all, so you can get a clearer picture and start using your garbage disposal on a best possible way.

On the market, you can find two main types of garbage disposals – batch and continuous feed models. Other differences are with or without an electrical cord (hardwired models), different strengths, with or without a quick-mount neck for easier installation, etc.

Installation of a new garbage disposal or changing old one is quite an easy task even for people with little experience in DIY projects. If you want to save money which you will pay for plumber services, you can follow the next steps and pieces of advice and install it by yourself.


Before any attempt to install your new garbage disposal unit in the kitchen sink, you should read and understand the manufacturer manual and prepare the tools and materials required for this job.

You will need:

  • a few types of screwdrivers;
  • adjustable wrench;
  • circuit tester;
  • plumber’s putty;
  • twist-on wire connections;
  • electrical tape;
  • Hammer;
  • Bucket;

It’s essential to know that there are four connection points for your new sink disposal:

  • Under the drain, where the garbage disposal connects to the sink
  • Where the drain line connects to the disposal
  • Where disposal connects to a power source
  • And optional, where the dishwasher connects to the disposal.

One of the most important things on which you need to pay attention when you are choosing a garbage disposal unit for your kitchen is which kind of electric connection it requires. Most of them have a cord with the plug, while others are hardwired. 

If you choose one with the plug, and you don’t have a power outlet nearby, it’s the best solution to call a professional electrician to make one proper for you. 

Let’s begin.


Turn off the circuit breaker to your kitchen and use your circuit tester to make sure no electricity is flowing to the unit. 

Set the bucket under the sink and disconnect the drain pipes and remove the sink strainer. 

Scrape away and remove any old plumber’s putty.

On the new drain, apply a generous amount of plumber’s putty around the flange to act as a gasket and press it into place, back in the drain hole.

Lay a towel in the sink and set the disposal on the flange to keep it from moving.

Underneath the sink, stack the fiber gasket, backup flange, and mounting ring, and slid onto the underside of the flange. Install the snap ring by pulling it open and snapping into place.

Then tighten the screws evenly, so they are firmly against the backup flange and clean up any excess putty.

To connect to the dishwasher drain, use a hammer to knock out and remove the drain plug from the inlet on the disposal. 

In the next step, remove the wire cover plate and connect the electrical cord by matching the wire colors and push the wires back in and reattach the plate.

(If you need to hardwire the unit, make sure the power is off to the box, and then attach the wires to the corresponding color using wire nuts)

In the case where you have a built-in plug, turn it in a power outlet.

To connect the drain, insert its gasket in the discharge outlet. Then attach the discharge tube with the flange and bolts.

Hang the disposal by aligning the three tabs with the mounting ring.

Use the wrench to turn and lock the tabs over the ridges. 

Then connect the dishwasher drain. Make sure the discharge pipe is lined up properly and connect your drainpipes – use a T-pipe before your P-trap.

It’s time to test your installation. 

Test your connections by placing the stopper into the sink drain and filling the sink with water and check for any leaks. Plug in the disposal and turn on the power, and your job is done. 


Modern waste disposal units have many different options that will make it easier for you to use every day. There are always many different models on the market, and you will find the best garbage disposal for money, which will completely fit your needs. Read other blog articles to help you decide which one you need. Also, consult with your local sewer authorities about the domestic disposal policy. Some municipalities must give your permission to use the garbage disposal unit, and some discourage the use of them because of ecological issues and the capacity of the sewers.


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