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Garbage Disposal Installation Guide
August 3, 2024
-
By
Ethan Clarke
Wondering how to install a garbage disposal unit? Then you’re in luck, because we’ll be going through the entire process in detail below.
From gathering your tools to testing your handiwork, you’ll learn everything you need to know about how to remove your old unit and how to secure a new one – all in a few clear steps.
Gathering Your Toolkit
Every successful DIY project begins with the right tools and materials. Let’s compile a list of what you’ll need to install your garbage disposal smoothly.
Essential Tools Required
You’ll need a few tools including screwdrivers, adjustable pliers, and a pipe wrench. They will allow you to disconnect the old unit and install the new one. Also, keep a hammer handy – you never know when it might come in handy.
Materials Checklist
Aside from the disposal unit, it’s a good idea to have a bucket on hand. That way, you’ll have somewhere for the waste water and debris to go, just in case.
Safety First
Safety is not something you want to compromise on. First things first, disconnect the power supply to the garbage disposal before starting. And be sure to familiarize yourself with the safety instructions provided with your disposal model.
How to Remove the Old Disposal Unit
The old unit must first come out before you can install the new disposal.
Step 1: Turn the Power Off
Before you begin, switch off the circuit breaker or unplug the unit. Remember, safety first.
Step 2: Remove the Pipe
Using a pair of slip-joint pliers or an adjustable wrench, loosen the compression fitting that holds the sink drain pipe to the disposal and remove the pipe. Be prepared to catch any drainage or debris with a few towels.
Depending on the type, you may also need to remove the electrical cover plate to access the electrical cable connector.
Step 3: Remove the Disposal Unit
Detach the disposal from the sink mount by loosening the mounting ring. You should now be able to unscrew the disposal unit.
Supply:
- Slip-joint pliers
- Adjustable wrench
- Towels
Cleaning the Sink Opening
Before you put in the new garbage disposal, you want to prepare the area.
Supplies:
- Putty knife
- Damp cloth
Step 1:
Using a putty knife or similar tool, remove any residual plumber’s putty from the drain.
Step 2:
Give the drain opening a good wipe with a damp cloth. Remember, the surface should be smooth and free of debris.
Preparing for the New Garbage Disposal Installation
With the old unit removed and the sink surface cleaned, it’s time to install the new disposal unit.
Attaching the New Sink Flange
Before the new garbage disposal goes in, however, you need to attach a new sink flange.
That includes a fiber gasket, backup flange, and mounting ring. You’ll also need a rubber seal or metal flange between the sink and the disposal unit to ensure a proper seal.
Supplies:
- Plumber’s putty
- Mounting ring and gaskets
Step 1:
Roll a half-inch rope of plumber’s putty and place it around the drain opening.
Step 2:
Press the sink flange onto the putty and apply weight to secure it in place. Then secure the flange using a mounting ring and gaskets.
Installing the New Garbage Disposal Unit
The next steps involve securing the mounting assembly, connecting the electrical wires, and aligning the disposal with the mounting tabs.
Supplies:
- Mounting screws
- Screwdriver
- Wire nuts
Step 1:
Using mounting screws, secure the mounting assembly.
Attach the lower mounting ring to the sink mounting assembly by sliding it over the sink flange.
Then, tighten the screws until the mounting assembly is secured against the sink.
Step 2:
Wire the power cord to the disposal by matching and connecting the colored wires. Secure the wires using wire nuts afterwards.
Step 3:
Secure the garbage disposal unit to the sink and align it properly, rotating the unit until the mounting tabs are securely locked.
Connecting the Dishwasher Drain (Optional)
If your dishwasher’s drain water is meant to run through your disposal unit, you’ll need to connect the dishwasher drain hose as well.
Supplies:
- Screwdriver
- Hammer
- Hose clamp
Step 1:
To connect the disposal to the dishwasher, you have to first remove the knockout plug.
We recommend using a screwdriver and hammer (or a rubber mallet) to dislodge and remove the plug from the disposal unit.
Step 2:
Ensure the drain hose has no kinks – that will allow it to maintain proper flow and prevent blockages.
Then, secure the hose to the garbage disposal using a hose clamp.
Finalizing the Installation
The final step is to connect the pipes, then all that’s left is to turn on the unit.
Supplies:
- Tube cutter
- Slip nuts
- Washers
- Paper towels
Step 1:
Adjust the discharge tube as needed by cutting it to the correct length using a tube cutter.
Then attach the drain pipes using a combination of slip nuts and washers.
Step 2:
Fill the sink with water and check for leaks.
It’s a good idea to wrap paper towels around the top of the disposal, drain discharge elbow, and dishwasher connector – that will allow you to easily identify water leaks when the sink is filled.
Once you’re sure there are no leaks, you can plug the disposal unit into the electrical outlet and turn on the power.
Maintenance Tips for Your New Garbage Disposal
Regular maintenance will not only prevent unpleasant odors but will also prolong the lifespan of your unit.
Be Careful What You Put Down the Drain
Just because it’s a garbage disposal doesn’t mean it can handle everything. Hard objects like bones, popcorn kernels, and fruit pits can cause jams and potential malfunction. The same goes for fibrous food scraps, fats, oils, and non-food substances like paint.
Cleaning Your Garbage Disposal Unit Regularly
Keeping your disposal clean is easier than you might think. Here’s what you want to do.
Supplies:
- ACTIVE Garbage Disposal Cleaner
- Water
Step 1:
Run hot water for one minute, then reduce the water to a slow trickle.
Step 2:
With the faucet running, place one ACTIVE Disposal Cleaner Tablet inside the drain, then run the garbage disposal for one minute.
Step 3:
Continue to run the garbage disposal until all of the foam drains, then turn off the unit.
We highly recommend using ACTIVE Garbage Disposal Cleaner tablets once or twice a month to prevent odors and grime buildup.
ACTIVE Disposal Cleaner
Powerful foaming tablets to clean and remove grime from inside garbage disposal units.
Cleaning Your Garbage Disposal With Baking Soda and White Vinegar
If you don’t have a specialized cleaner like the one by ACTIVE, you can improvise with baking soda and white vinegar.
Supplies:
- Baking soda
- White vinegar
Step 1:
Pour half a cup of baking soda, followed by one cup of white vinegar into the drain. Let it sit for 10 minutes; you’ll notice some fizzing action.
Step 2:
While running hot water, turn on the garbage disposal. Leave it on until all of the residue is washed away.
Knowing How to Install a Garbage Disposal
With that, you’re armed with all the knowledge you need to remove and install a garbage disposal. Remember, safety always comes first – so remember to unplug the unit before starting.
As long as you have the necessary tools, you should be able to complete the task. And you can always refer back to this guide if you need help.
Key Takeaways
- Installing a garbage disposal requires specific tools and safety procedures
- Before installing a new unit, you must prep the sink opening, set up a mounting ring, and new sink mounting flange with plumber’s putty
- To install the new unit, you have to secure the mounting assembly, connect the electrical wires, and properly align the unit
How to Install Garbage Disposal – FAQs
What tools do you need to install garbage disposals?
You will need a basic toolkit including a hammer, screwdrivers, a putty knife, safety glasses, as well as bucket. Additional tools like a pipe wrench and wire nuts will also be necessary for setting up plumbing and electrical outlets.
How do I safely remove my old garbage disposal unit?
To remove your old garbage disposal, first disconnect the power supply. You can then remove the unit using an adjustable crescent wrench and screwdriver.
How do I maintain my replacement garbage disposal?
We recommend cleaning your garbage disposal with ACTIVE Garbage Disposal Cleaner Tablets once to twice a month. Also, pay attention to what goes down the drain. Avoid putting hard objects (e.g. bones, fruit pits) and fibrous food scraps down the drain as they can cause damage to the unit.
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Ethan Clarke
Ethan Clarke is a seasoned expert in appliances and household waste systems. Referencing his extensive experience as an appliance repairman, Ethan shares his invaluable knowledge through detailed maintenance & troubleshooting manuals. Ethan’s insights help homeowners understand and maintain their appliances efficiently, ensuring longevity and optimal performance. He’s here to provide practical, easy-to-follow advice for all your appliance needs.
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