How To Plumb A Single Bowl Kitchen Sink With Disposal

Are you tired of removing dirt and food particles from the kitchen sink? Are you tired of seeing your kitchen sink messed up? This is one of the major problems most modern homeowners face. Plumbing a single bowl kitchen sink with disposal is highly necessary.

Here, I will be showing you what you need to know on how to plumb a single bowl kitchen sink with disposal and why it is important, and the techniques involved in installing disposal to a single bowl kitchen sink.

Can Garbage Disposal Be Installed In A Single Bowl Sink?

It is possible to install a garbage disposal in a single bowl sink. Also, it is easier to do than installing one to a double sink.

Before you begin the installation process, you must first confirm that there is enough space under the sink that can contain the disposal and the pipes can be aligned properly.

Electrical wiring must be made available under the sink for the connection for disposal to be installed. Also, a switch should be made available for turning the device both on and off, and it should be easily accessible. The wall switch is preferable.

However, you must note that not every single bowl sink is compatible with disposals. For instance, disposals can’t fit into farmhouse sinks due to their thick bodies.

What Is The Cost Of Installing A Garbage Disposal On Single Bowl Sink

On average, the total cost of buying disposal and getting labor to install it for you is about $226. The cost of disposals varies depending on the type of brand. Some brands go for as low as $85, while are as high as $200 and above, in the same way, labor due to their level of expertise varies and cost from $80 and $200. Also, geographical location is a great determinate factor to the average cost.

However, installing disposal in a single-bowl sink is simple, and as such, it should cost you lower than installing it on a double bowl sink. This also means that the process is less complicated, and you can do it.

So I will be showing you a DIY approach in getting disposal installed into a single bowl sink.

The Tools Required To Plumb A Single Bowl Kitchen Sink With Disposal

For a successful DIY installation process, the following tools are required. They are:

  • A disposal unit
  • Screwdriver
  • Wire strippers
  • Wire nuts
  • Hammer
  • Utility knife
  • Large slip-joint pliers
  • A cloth or rag Plastic putty knife
  • Plumber’s putty
  • Non-contact electrical tester

Step by Step Procedure To Plumb A Single Bowl Kitchen Sink With Disposal

It should interest you to know that using the above tools, and you can easily install a disposal system on a single bowl sink within two hours.

You need to note that some models’ disposal may require a different installation process than the one discussed below. It is advised that before you begin the installation, do consult the disposal’s manual, and it will give you an upper hand.

The steps include:

  • Prepare beneath the sink by clearing off all unnecessary items so that you can have enough space to carry out your task.
  • Turn off the circuit breaker of the disposal unit’s wiring.
  • Verify that electricity is disconnected in the wire that runs through the disposal under the sink. You can use a non-contact electrical tester for the verification. If you notice that the tester lights up after switching off the breaker, immediately turn off every other breaker until the tester shows no light.
  • Using the slip-joint pliers, undo the couplers connecting P-trap and the drain’s extension pipe underneath the sink. Keep the drain sections apart and use the rag to plug the drain line to provide control and regulation of an odor coming out from it.
  • Using the pliers, unscrew the nut situated beneath the drain coupling. Once it is loosened, you can push the coupling upwards to demarcate the drain flange from the sink’s bottom.
  • Next, use a plastic putty knife to scrape off the old plumber putty off the drain hole. Because if you don’t, it may give you issues fitting it back.
  • Take some putty, and rub around the garbage disposal unit’s sink flange. Fix the flange into the hole beneath the sink’s bottom, then carefully move the backup ring and gasket to the flange’s open sleeve beneath the sink.
  • Fix in the mounting ring and snap it on. Ensure you tighten all the screws till all the units get fit firmly.
  • Clear off any excess plumber’s putty.
  • If you have a dishwasher connected to the sink, you will have to push out the dishwasher knockout plug using a screwdriver and hammer. However, If the plug won’t disturb you, you can leave it in place.
  • Take off the disposal unit’s wiring compartment cover, including six inches of electrical cable from the wall switch. Next, attach the cable into the wire clamp inside the wiring compartment, then tighten up the clamp using a screwdriver.
  • Get a utility knife to unsheathe the six inches of cable already fixed inside the wiring compartment. Then use the wire strippers to take off about half an inch of insulation from the black and white wires.
  • Attach the wire nuts to the white cable wire on the disposal unit, and in the same way, the black cable wire to the unit’s black wire. Next, wrap the bare wires onto the green grounding screw in the unit, and then use a screwdriver to tighten it up. Then, tuck all the wires into the wiring compartment and shut it off.
  • Carefully mount the disposal system on the mounting ring in the direction where the mounting unit faces the drain pipe. Turn repeatedly the mounting ring to ensure it is tightened and firmly in place.
  • Mount the disposal discharge tube inside the disposal’s outlet before you begin tightening up the coupler.
  • Remove the rag from the drain line before installing the P-trap and extension pipe. Use the slip-joint pliers to tighten up the couplers.
  • Connect the drain line to the dishwasher knockout and tighten up the coupler if you have a dishwasher.
  • Put on the circuit breakers and open the faucet over your sink. Then switch on the disposal unit examine the work you just finished. If you don’t hear unexpected sounds or see water leakages, it means you did a good job, and your disposal unit is fit and ready for usage.

What Are The Benefits Of Installing A Disposal System To A Sink

In these modern times, every kitchen is expected to have a disposal connected to its sink. You should have one.

Below are the benefits you will reap from having disposal connected to your sink.

  • Disposal helps prevent clogging by breaking down the food particles that go down the drain.
  • Trashing out less food helps curb the appearance of rodents and other rodents who always visit your garbage for food particles.
  • Attaching a disposal unit to your sink helps prevent the uprising of odor that comes from rotten garbage.
  • Speeds up the washing of the dishes.
  • Using disposal, you get more of your food waste down the drain, thereby the quantity of trash you produce for the landfill. So you can say that disposal is environmentally friendlier.

Can A Garbage Disposal Back Up Into A Dishwasher?

Suppose you have a single-drain sink connected to both the disposal and dishwasher. In that case, you may experience minor issues, such as waste from the disposal going into the dishwasher, which can be quite messy. The waste can get into the dishwasher through the drain hose that connects the dishwasher to the disposal unit. When a clog occurs in the disposal, this is bound to happen.

However, this issue can be preventable by pouring hot water down your drain once a week to wash away all clogged debris.

If the sink is for commercial purposes, you can contact your local plumber to know what will work best for your disposal model.

Frequently Asked Questions (FAQs)

Can You Use A Garbage Disposal With A Single Bowl Sink?

Yes, it is definitely possible to have a single-bowl sink with disposal attached. Plus, plumbing a disposal system to a single bowl sink is easier than adding one to a double sink.

Also, it is essential to a single bowl sink because the single bowl sinks are more useful for washing large pots or plates, which definitely will need the help of disposal.


It is much possible to plumb disposal to a single bowl sink, and the advantages are not something you want to miss out on.

I hope you loved and found this article interesting. You may like “How To Plumb A Kitchen Sink With Disposal And Dishwasher.”



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