A man in a blue apron washing dishes in a kitchen.

How to Install a Garbage Disposal in a Double Sink: A Step-by-Step Guide

Are you ready to tackle a new DIY project and install a garbage disposal in your double sink? The task can seem daunting, but with the right tools and guidance, it’s completely doable for even the most novice homeowner.

This step-by-step guide will walk you through each detail of the process, making sure that you avoid any common mistakes along the way. Get ready to roll up your sleeves; let’s dive into this plumbing adventure together!

Key Takeaways

  • Installing a garbage disposal in a double sink is doable even for beginners with the right tools and guidance.
  • Important tools you’ll need include an adjustable wrench, screwdriver, plumber’s putty, pliers, wire stripper/cutter, and electrical tape.
  • Necessary materials for installation include a new garbage disposal unit, drain flange assembly kit, P-trap kit for plumbing connections, and rubber gloves for protection.
  • Follow the step-by-step guide to install the disposal: check inside for debris or objects; remove existing disposal if applicable; align and secure new disposal; wire it according to manufacturer instructions; insert drain flange with plumbers putty; connect outlet to P-trap using appropriate fittings; tighten all fasteners securely and test for leaks.

Tools and Materials Required

To install a garbage disposal in a double sink, you will need the following tools: adjustable wrench, screwdriver, plumber’s putty, pliers, wire stripper/cutter, and electrical tape.

Additionally, gather the necessary materials such as a new garbage disposal unit, drain flange assembly kit with gaskets and screws, P-trap kit with washers and nuts for connecting the outlet to the plumbing system, and rubber gloves for protection.

List of necessary tools

You need the right tools for this task. Here is a list of what you will need:

  1. Screwdriver: This tool helps to tighten screws and bolts.
  2. Wrench: Use this to loosen or tighten parts of the sink or disposal.
  3. Plumber’s putty: You apply this on certain parts to stop leaks.
  4. Bucket: Have this ready to catch any water when you take off pipes.
  5. Gloves: Wear these for safety when handling sharp edges.
  6. Wire stripper: You use this if you need to cut wires for the new disposal.
  7. Voltage tester: This checks if power is off before working with wires.
  8. Hacksaw: Sometimes, pipes may need cutting to fit your new garbage disposal.

List of necessary materials

To install a garbage disposal in a double sink, you will need the following materials:

  1. Garbage disposal unit
  2. Plumbers putty
  3. Snap ring or mounting ring
  4. Dishwasher connector kit (if connecting to a dishwasher)
  5. P – trap assembly
  6. Pipe wrench or adjustable wrench
  7. Screwdriver (flathead and Phillips)
  8. Plunger
  9. Bucket or basin for catching water
  10. Towels or rags for cleanup

Step-by-Step Guide for Installing a Garbage Disposal in a Double Sink

To install a garbage disposal in a double sink, follow these step-by-step instructions for a successful installation:

1. Check the inside of the garbage disposal to ensure it is clear of any debris or objects.

2. If you have an existing disposal, remove it by disconnecting the electrical and plumbing connections.

3. Install the new disposal by aligning it with the mounting ring and twisting it into place until secure.

4. Wire the disposal by connecting the electrical wires according to the manufacturer’s instructions.

5. Insert the drain flange into one of the sink holes and secure it with plumbers putty and snap ring.

6. Connect the outlet of the garbage disposal to the P-trap using appropriate plumbing fittings.

7. Tighten all fasteners securely and test for leaks by running water through both sinks.

By following these steps carefully, you can successfully install a garbage disposal in your double sink without any hassle or issues

Checking the inside of the garbage disposal

Before installing a garbage disposal in your double sink, it’s important to check the inside of the unit. Start by removing any packaging or protective materials from the disposal.

Take a look inside and make sure there are no foreign objects or debris that could cause damage or clogs. It’s also a good idea to read the instruction manual that comes with your garbage disposal, as it will provide specific details on how to check and prepare the inside.

By taking this step before installation, you can ensure that your new garbage disposal is ready to work efficiently and effectively in your double sink setup.

Removing the old disposal (if applicable)

If you already have a garbage disposal in your double sink, the first step is to remove it. Follow these simple steps: 1) Disconnect the power source to ensure safety. 2) Loosen the mounting screws or brackets that hold the disposal in place.

3) Detach the disposal unit from the sink by twisting it counterclockwise and lifting it out. If there are any remaining connections, disconnect them carefully. Be sure to dispose of your old unit properly according to local regulations for waste management in your area.

Installing the new disposal

To install the new garbage disposal, start by removing it from its packaging and reading the owner’s manual for instructions. Make sure to disconnect the power supply before starting any installation work.

Next, you will need to connect the disposal to the sink drain by inserting the drain flange into the sink hole. Apply plumber’s putty around the flange to create a watertight seal.

Then, tighten the flange with a mounting ring or snap ring provided with your disposal.

Once securely in place, use wire nuts or other recommended connectors to wire the disposal according to manufacturer instructions and local electrical codes. Take care not to damage any wires during this step.

When all wiring is complete, attach the outlet end of your garbage disposal unit to your P-trap assembly using slip nuts and washers. Check that all connections are tight and secure.

Before testing for leaks, make sure there are no foreign objects inside or jamming up your new garbage disposal unit. Finally, turn on both water faucets and carefully test your installation by running water down each side of your double sink while also turning on and operating your new garbage disposal unit.

Wiring the disposal

To wire the disposal, you will need to connect the electrical wires properly. Follow the instructions provided in the owner’s manual to ensure a safe and correct wiring process. Make sure that the power is turned off before starting this step.

Use wire nuts to connect the black wires together, white wires together, and green or bare copper wires together. Double-check all connections to ensure they are secure. Once everything is wired correctly, you can proceed with completing the installation process of your new garbage disposal.

Inserting the drain flange

To insert the drain flange, follow these steps. Apply a thin layer of plumber’s putty around the underside of the flange. Then, insert it into the sink’s drain hole and press firmly to create a tight seal.

Make sure the flange is centered and level before proceeding with the next steps. This step is crucial for preventing leaks and ensuring proper drainage in your double sink installation.

Connecting the outlet to the P-trap

To connect the outlet of the garbage disposal to the P-trap, you will need a piece of pipe called a tailpiece. This tailpiece connects to the outlet and extends down into the P-trap.

It is important to make sure that this connection is secure and watertight to prevent any leaks. Use a slip nut and washer to attach the tailpiece to both the outlet on the garbage disposal and the inlet of the P-trap.

Make sure everything is tightened properly using pliers or a wrench, but be careful not to overtighten and damage any parts. Once connected, run water through your sink and check for any leaks at this connection point.

Tightening fasteners and testing for leaks

To ensure that your garbage disposal is securely in place and doesn’t leak, you need to tighten all the fasteners properly. This includes tightening any screws or bolts that hold the disposal unit together or attach it to the sink.

Make sure everything is nice and snug, but be careful not to overtighten and damage anything.

Once everything is tightened, it’s time to test for leaks. You don’t want any water seeping out of your garbage disposal and causing a mess under your sink. To check for leaks, fill your sinks with some water and let them drain while running the garbage disposal.

Keep an eye on all the connections underneath the sink as well as around the drain flange area. If you notice any signs of leakage, like dripping water or wet spots, you’ll need to identify where it’s coming from and fix it before using your garbage disposal regularly.

Tips and Tricks to Avoid Leaks and Mistakes

Learn how to avoid leaks and common mistakes during the installation process with these helpful tips and tricks. From proper sealing techniques to ensuring a secure connection, these expert suggestions will help you achieve a successful and leak-free garbage disposal installation in your double sink.

14 tips for successful installation

Here are 14 tips to help you successfully install a garbage disposal in a double sink:

  1. Read the installation instructions in the owner’s manual carefully.
  2. Gather all the necessary tools and materials before you begin.
  3. Turn off the power to the disposal at the circuit breaker before starting any work.
  4. Use caution when handling sharp objects like pipes and screws.
  5. Disconnect the pipes under the sink by loosening the fittings with a wrench or pliers.
  6. Remove the old strainer by unscrewing it from the bottom of the sink.
  7. Apply plumbers putty around the opening where the new drain flange will be installed.
  8. Install the snap ring onto the flange to secure it in place.
  9. Hold the garbage disposal in position under the sink, aligning it with the drain flange opening.
  10. Follow manufacturer’s instructions for wiring and connecting electrical connections properly.
  11. Make sure to connect the dishwasher drain line if applicable, following instructions provided.
  12. Attach two traps between each sink and connect them to outlet pipe using slip nuts and washers.
  13. Tighten all fasteners securely but avoid over – tightening which could cause leaks or damage.
  14. When everything is installed, turn on water supply slowly and check for any leaks.

Common Issues and Troubleshooting

If you encounter any problems with your garbage disposal installation, there are a few common issues you may come across. To troubleshoot these problems, try checking the power supply and connections, ensure all pipes are properly connected and sealed, and make sure the disposal is clear of any debris or clogs.

3 things to try before removing the garbage disposal

Before you remove the garbage disposal, try these three things:

  1. Reset the disposal: Look for a small red button on the bottom of the disposal unit. Press it to reset the motor. Sometimes, a simple reset can fix any issues.
  2. Clear any clogs: Use a plunger or a plumbing snake to clear out any clogs in the disposal or drain pipes. This can help restore proper functionality without having to remove the entire unit.
  3. Check the power supply: Make sure that the garbage disposal is properly plugged in and receiving power. Test other appliances in the same outlet to ensure there are no electrical issues. If necessary, reset any tripped circuit breakers.

Troubleshooting common problems

If you encounter any issues during the installation process, here are some common problems you may face and how to troubleshoot them:

  1. Garbage disposal not turning on:
  • Check if it is properly wired and connected to power.
  • Ensure that the switch is in the “On” position.
  1. Clogged drain:
  • Use a plunger or drain snake to remove any blockage.
  • Avoid putting large food particles or grease down the disposal.
  1. Leakage:
  • Tighten all connections, especially around the flange and drain pipes.
  • Apply plumber’s tape to create a watertight seal.
  1. Unusual noise:
  • Clear out any foreign objects stuck in the disposal.
  • Check for loose parts or damaged blades.
  1. Overheating and tripping circuit breaker:
  • Allow the motor to cool down before using again.
  • Reduce the amount of food waste being fed into the disposal at one time.


In conclusion, installing a garbage disposal in a double sink is a simple process that can be done with the right tools and materials. By following the step-by-step guide, homeowners can successfully replace their old disposal or install a new one.

It’s important to carefully read the owner’s manual and take note of any specific instructions provided by the manufacturer for optimal installation. With patience and attention to detail, homeowners can enjoy the convenience of a properly functioning garbage disposal in their kitchen.


1. What does installing a garbage disposal in a double sink mean?

Installing a garbage disposal in a double sink means setting up waste management in the kitchen by applying plumbing skills. It also includes wiring, disconnecting sink pipes and replacing an old garbage disposal.

2. How can I remove my old garbage disposal from my double sink?

Removing a garbage disposal involves disconnecting pipes and removing the strainer. You should have some basic plumbing tools ready for this home improvement project.

3. What are some tips to help me install my new garbage disposal?

Install your new garbage disposal by first installing the assembly and holding the unit in place. Next, apply plumber’s putty around it before putting on snap ring.

4. Is there any difference between single and double sink when Installing Garbage Disposal?

Yes, Plumbing connection differs for both as Double Sink Plumbing requires different steps making it more complex but equally effective for waste management once installed correctly.

5: Can changing or replacing my own Garbage Disposal be taken as DIY task?

Absolutely yes! With right tips & step-by-step guide presented; from removing to replacing you’ll be able to handle this activity of waste management under your very own ‘Home Improvement Projects’.

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