DIY Plumbing Installation/Repair How to Install a Garbage Disposal
How to Install a Garbage Disposal Print E-mail
Written by Tom   

Garbage Disposal

The reason you would want to replace your current disposal would more than likely be because of wear and tear. A garbage disposal is a very impressive piece of machinery, but at the end of the day it can wear down over time just like everything else. Grime can get clogged up over time and make it a lot harder to operate. Even if you maintain your garbage disposal on a regular basis through cleaning materials specifically designed for it, you will still find that over time the efficiency of the garbage disposal will drop dramatically. Therefore, replacing an existing disposal is something you are probably going to have to do at least once in your life

What does a Garbage Disposal actually do?

Garbage disposals are designed so that any large pieces of garbage that goes down your drain is ground up into very small pieces. This in turn allows them to go through your kitchen plumbing system safely without clogging anything along the way. The fact that they help avoid clogging and damaging the plumbing system is one main reason garbage disposals are very popular these days. Much more than just items of convenience, garbage disposals can actually help to prolong the life of your current kitchen plumbing setup.

The Right Garbage Disposal for You

In installing the right kind of garbage disposal you need, you will have to consider things like power and other features. There are different types of garbage disposals available these days with different options/ features. The amount of power as measured in horsepower is different for each garbage disposal. Some garbage disposals also come with a reversible option that you can use if clogging occurs in the disposal due to too many large chunks being processed at the exact same time. To get the garbage disposal that is perfect you, you must consider your budget and the features or options you need.

Required Tools

Besides the garbage disposal, you are also going to need:

  • Electrical switch
  • Hose clamps
  • Wire nuts
  • Plumber's putty
  • Pliers
  • Pipe wrench
  • Hacksaw
  • Screwdrivers (philips, flat head)
  • Uninstall the Old Disposal

    Important

    Before you do anything with the sink, you need to make sure that the electrical circuit is off. You are going to be disconnecting connections during the process and if you do not remove the electrical circuit you could end suffering an electrical shock. Also make sure that you do not turn the faucet on at any point during the removal or installation processes as that could lead to problems later down the road. After that it is simply a matter of disconnecting all the wires and removing the old disposal before you go ahead and install the new one.


    Remove Disposal

    Installing the New Disposal

    The first thing you want to do is make sure that the sink's down drainpipe is disconnected from the p-trap; this can be done using the pliers. Remove the parts entirely at this point and then unscrew the nut under the sink that holds the strainer body and the sink together, removing the strainer once the nut has been removed.

    With that accomplished, you should now take the plumber's putty and place it around the opening in the sink where the drain would go. Be sure to make the putty an even quarter inch in thickness around the sink area. Take the new sink flange and press it into position on top of the putty before taking the backup ring and fiber gasket and placing them up into the sleeve from underneath the sink. With that done, you can take the mounting and snap rings and slip them onto the assemblage you just created. There should be three mounting screws in the setup and you should carefully tighten these screws a few twist at a time. This is not just to make sure that the entire assembly is level but also that you do not break the flange by tightening it too hard.

    Making sure that the electrical circuit breaker is in the off position; remove the bottom of the disposer to get at the wiring. Place the whole unit on its side and underneath the sink. Using the wire nuts you appropriated earlier, connect the white disposer wire to the white power supply wire and repeat the process with both black wires before repeating it once again with the ground wires. With that done, place the bottom back onto the disposal unit. If you have a dishwasher, this is the point where you want to remove the dishwasher knockout plug on your disposal.

    Disposal Hose

    The sink mounting assembly should have three ears, which you can use to lock the disposal into place. Once you have done that, you can take the discharge tube and the accompanying gasket and connect them to the disposal, aligning the unit so that it flows in the same direction as the drain trap that you reattached.

    At this point, all that is left to do is lock the disposal in completely (refer to the instructions that came with your manual) and then run water through the disposal to test for leaks. Once that is done, you can turn the breaker back on and test the dishwasher out to see if it works.

    Comments (7)
    • Tomas  - Garbage Disposal Rating
      You need to also look at the ratings. You will want a more powerful garbage disposal if you have a septic tank to meet your possible local codes. But if this is not the case you should look at a typical 3/4 horse power and a chamber size in the 25 to 40 ounce range.
    • Omar Farooqui  - Re: NEED HELP INSTALLING DISPOSAL
      Dear Writer,
      I am trying to install a disposal ,and I need help. I like kinda get how to intall this ,but still need help please E-Mail me a video of how to install a disposal system. My e-mail address is omarfarooqui31@yahoo.com
    • David  - hi i am tryin to replace an existing garbage dispo
      Hi i was wondering if yoou can help me iam trin to replace an exhisting garbage dispoal an i am havin difficulty removeing old one. could you please tell me how to seperate the unit from the pipe that drops from the sink into the unit. thank you! DAVE
    • cathy russell
      My husband installed a dishwasher. I told him that the knock-out plug on the disposal had to be knocked out and the dishwasher had to discharge through the disposal. He did not do it this way. He bypassed the disposal and discharged the dishwasher into the drain pipe.I think this is wrong. Please advise :pirate:
    • angel
      My house was built in 1942 and my boyfriend is really handy and smart. He is installing a garbage disposal but he isnt sure how to tie the exsisting plumbing into the new ones. I have a double bowl sink so his question is what is the correct configuration for the disposal. Any comments would help. thanks!
    • rick
      I have a switch that operates the garbage disposal. How do I wire a new dish washer to the garbage disposal plug so that the dish washer will work without the garbage disposal working at the same time when the switch is on?
    • jack brogan  - double sink how do you see replays
      angel wrote:
      My house was built in 1942 and my boyfriend is really handy and smart. He is installing a garbage disposal but he isnt sure how to tie the exsisting plumbing into the new ones. I have a double bowl sink so his question is what is the correct configuration for the disposal. Any comments would help. thanks!
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