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How to Install a New Garbage Disposal Properly?

Garbage disposal is perhaps one of the most useful plumbing tools out there for keeping your pipes clean. It helps you handle waste and many different types of litter. If you want to have one in your sink and have yet to know to properly install one, this article will show you just that. Here is how to install a new garbage disposal properly.

How to install a new garbage disposal properly - intro

What you need to install a new garbage disposal

The process of installing a new garbage disposal will be more straightforward if you already have one in place. In this case, you will only need to disconnect the old unit and connect the new one. However, if you don't have an existing disposal, additional materials will be necessary to complete the installation.

How to install a new garbage disposal properly - prepare gadgets

Access to an electrical outlet located under the sink is necessary to install a new garbage disposal. This may require the installation of an outlet in your kitchen, particularly if your home is older and does not have one already. Hiring a licensed electrician to handle this task before beginning the installation process is recommended.

Installing the disposal unit under the sink and connecting the hose to facilitate the flow of wastewater can be a bit challenging, but it can be done even without professional plumbing experience.

To ensure safe and efficient installation, having the necessary tools and materials is important. The list of the items is as follows:

  • New hoses and disposal

  • A bucket and towels (or rags)

  • Electrical wires

  • Safety items like goggles and dust masks

  • Screwdriver

  • Water pump pliers

  • A disposer wrench

  • A saw (a handheld one is more suitable).

Step by step to install a new garbage disposal

1. Read the instruction before executing

How to install a new garbage disposal properly - read the instruction

There’s always a manual attached to any new garbage disposal you buy fresh out of the store. It provides all the information required to properly install your garbage disposal, including a list of necessary tools and materials and step-by-step instructions specific to your model. Reviewing it beforehand can guarantee a seamless installation process without missing any crucial steps.

2. Get rid of the old disposal (if you’re already using one)

If you’ve yet to own a garbage disposal, you can go ahead and skip this step. You have to make sure that the water shut-off valve and your circuit breaker are turned off.

How to install a new garbage disposal properly - remove the old disposal if you had one

Begin by shutting off the power source, then detach the drain flange. Grasp it with one hand and turn it counterclockwise to release it from the sink. Next, use pliers to loosen the hose clamp from the discharge pipe.

3. Connect your new disposal to the wires

This step depends on whether your disposal unit comes with a power cord or not. In some cases, it may not be included and will need to be wired using either the old power cord from your existing disposal or a new one.

How to install a new garbage disposal properly - wire the new disposal

To wire the disposal, first, remove the small plate located on the bottom to expose the capped wires. Most cords and disposals have standard-colored wires. It is recommended to follow the manufacturer's instructions, but in general, the black wire should be connected to the black wire, the white wire to the white wire, and the green wire to the ground screw.

4. Put a new drain in

To ensure proper installation, replace the existing drain flange with a new one for your disposal. Gently pry it up and remove any old plumber's putty. Then, install the new drain flange by applying 1/4 inch of new putty around the underside and pressing it firmly into the drain hole.

How to install a new garbage disposal properly - put a new drain in

To secure the drain flange in place, place a towel or pad over it and place a weight on top, or have someone apply pressure while you mount the garbage disposal underneath.

5. Change your mounting ring

How to install a new garbage disposal properly - change the mounting ring

Different garbage disposals use different mounting rings. To change the ring, do as follow:

  • Position the rubber gasket between the drain flange and the mounting ring.

  • Tighten the fasteners on the mounting ring until they are secure but not overly tight.

  • Continue tightening until the mounting is in close contact with the gasket, ensuring a watertight seal.

6. Install your new garbage disposal

How to install a new garbage disposal properly - Install the new disposal

Next, carefully lift the disposal to attach it to the sink mounting assembly. Secure it by turning it into position, connecting the snap ring, and tightening the appropriate fasteners.

7. Reconnect the drain hose and the P-Trap

Then, connect the disposal to the P-trap and drain hose (or dishwasher hose). The process is straightforward, and you can find a tutorial on YouTube.

How to install a new garbage disposal properly - Reconnect drain hose and p-trap

If you wish for the dishwasher to drain into the garbage disposal, remove the plugs on its side with a screwdriver and hammer. Leave the plugs in place if there is no dishwasher hose to connect.

8. Check for leaks thoroughly

How to install a new garbage disposal properly - Check for leaks and tighten the screws

Make sure the disposal is properly secured and the drain flange is even with the surface.

  • Tighten all the mounting screws until they are snug.

  • Wipe away any excess plumber's putty from the drain.

  • Connect the power source to the disposal and turn on the electricity and water.

9. Testing, testing, and testing

Don’t forget to test everything altogether after you’ve done installing a new garbage disposal. Place a bucket beneath the disposal in case of any leaks when running water. After turning on the water for a few seconds to a minute, activate the disposal. If there are no signs of leaks or unusual sounds, proceed to dispose of food waste.

How to install a new garbage disposal properly - testing post-installation

Those are the steps on how to install a new garbage disposal properly. The process itself is pretty straightforward to DIY. However, don’t leave things to chance. If you ever have doubts, contact a professional immediately. If you’re in San Jose, you can give us a call on this matter. We will be right over to assist you.


About Local Rooter Corporation.

Local Rooter Corporation has been working hard to satisfy the plumbing system needs of home and business owners in San Jose and surrounding areas. Integrity and skills are served as our top priorities Whether it is a service, repair, or installation job, our licensed technicians are here to heed the call of duty 24 hours a day, seven days a week. In addition to a wide range of standard services, we also provide a number of specialty plumbing solutions to homeowners in the area. Contact us at 408-641-9245

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