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How to install a garbage disposal in 10 steps

mhiplumbers • May 19, 2022

The garbage disposal is one of the most useful appliances in your kitchen. It allows you to quickly and easily dispose of food waste, helping to keep your sink clean and making the cleanup process easier.


They’re also an easy DIY project that can be completed in less than an hour.



In this article, we’ll walk you through the steps for installing a garbage disposal and show you what tools you’ll need for the job.

This is how to install a new unit in 10 simple steps.

You will need a few tools for this project including:

  • Screwdriver
  • Pliers
  • Disposer wrench (also called an Allen wrench)
  • Optional – Socket set


Step 1: Flush out old unit

Flush out any debris that may have collected in the sink drain by pouring some water down the drainpipe while operating the faucet at full force.


Step 2: Shut off the power and water supply

The first step is to disconnect any power supply to the disposal. This includes removing any electrical wires connected to the unit and turning off the circuit breaker or fuse that powers it.


If you’re not sure where your breaker box is, turn off all of the lights in your kitchen and see if the disposal still works. If so, it’s probably wired directly into your home’s main source of power. If not, it’s likely that it runs on its own circuit breaker or fuse box.

Shut off the water supply to the sink by turning off the valve under the sink.


If there are pipes underneath your sink, shut off the water valve closest to them using a wrench and turn on all faucets until no more water comes out.


Then turn off all faucets except one so that when you finish installing your new garbage disposal, at least one faucet will still be running so there’s no pressure buildup in the pipes where they meet your new disposal unit.


Step 3: Remove the sink stopper and drain pipe

Remove the sink stopper by unscrewing it from its stem and lift up on the mounting nut with a wrench. Then remove any pipe fittings on top of your sink flange (the part that connects to the sink drain). Inspect all parts closely for any signs of leaks or damage before proceeding.


Step 4: Remove the discharge tube

Unscrew the bolt holding the discharge tube to the sink flange, using a wrench and socket. If there is no bolt, remove the discharge tube by prying it off with a flat-head screwdriver.


Step 5: Remove all screws

If you can’t get at the mounting screws underneath the sink, use an allen wrench or hex wrench to take them out from underneath.

Remove any screws from inside the cabinet that is holding it in place and pull it out through the sinkhole.


Step 6: Remove the old unit

Rotate the rubber flange that seals between your sink and the unit counterclockwise so it pops off.


Step 7: Install the new unit

Place the new Garbage Disposal unit into position and line up the screw holes on top. Tighten down all of the screws on top with a screwdriver until they are firmly set into place.


Do not overtighten!


Step 8: Attach rubber flange

Attach the rubber flange back onto your sink drain hole (over top of your new Garbage Disposal unit), then put your mounting nut back onto its corresponding bolt, using pliers to tighten as much as possible without stripping out any plastic threads (they will break easily).


Then attach the other end of your mounting nut onto its corresponding bolt on top of your Garbage Disposal unit, using pliers again to tighten as much as possible without stripping them.


Step 9: Reattach the discharge tube if necessary


Step 10: Test your new unit

Put some dish soap into your new disposer and run water through it for about 30 seconds before starting up so you don’t get any surprises later on.


If you’re not sure how or do not have time to install a garbage disposal yourself, then it is best to call a professional plumber

The good news is that with MasterCraft Plumbers, we offer free estimates and same-day service.



If you would like to schedule an appointment, call us today at (760) 350-3888.

16 Jul, 2024
Living in San Diego comes with its unique set of plumbing challenges. From the hard water that can wreak havoc on your pipes to the occasional droughts that strain water resources, homeowners here face various plumbing issues. In this article, we'll explore some of the most common plumbing problems in San Diego and provide tips on how to fix them. We'll also help you understand when to call in a professional. 1. Clogged Drains Problem: Clogged drains are a frequent issue in many San Diego homes. They can occur in sinks, showers, and bathtubs, often due to the buildup of hair, soap scum, grease, and food particles. DIY Fix: Plunger: For minor clogs, a plunger can often do the trick. Ensure enough water is in the sink or tub to cover the plunger’s cup, and give it several firm plunges. Drain Snake: A drain snake (or auger) can break up the blockage for more stubborn clogs. Insert the snake into the drain and turn the handle to push it through the clog. Baking Soda and Vinegar: Pour a cup of baking soda and vinegar down the drain. Let it sit for about 15 minutes, then flush with hot water. When to Call a Professional: If you’ve tried these methods and the clog persists, it’s time to call a plumber. Persistent clogs can indicate a more severe issue in your main sewer line. 2. Leaky Faucets Problem: Leaky faucets are annoying and can also waste significant water, driving up your water bill. The cause is usually worn-out washers or seals. DIY Fix: Turn Off Water Supply: Before starting any repair, turn off the water supply to the faucet. Replace Washers and O-rings: Disassemble the faucet handle and replace any worn washers or O-rings. These parts are inexpensive and can be found at most hardware stores. Reassemble Faucet: Once the new parts are in place, reassemble the faucet and turn the water supply back on. When to Call a Professional: If the faucet continues to leak after you’ve replaced the washers and O-rings, the issue may be more complex, such as a corroded valve seat. A professional plumber can diagnose and fix the problem. 3. Low Water Pressure Problem: Low water pressure can frustrate daily tasks like showering and washing dishes. It’s often caused by the buildup of mineral deposits in pipes or fixtures, leaks, or issues with the municipal water supply. DIY Fix: Clean Aerators and Showerheads: Mineral deposits can clog aerators and showerheads, reducing water pressure. Remove these fixtures and soak them in vinegar overnight to dissolve the deposits. Check for Leaks: Inspect your plumbing system for leaks. Even a small leak can significantly reduce water pressure. Pressure Regulator: Ensure that your home's pressure regulator (if you have one) is set correctly. Adjust it if necessary. When to Call a Professional: If cleaning aerators and checking for leaks doesn’t solve the problem, there may be a more severe issue, such as a problem with the main water line or pressure regulator. A plumber can diagnose and fix the issue, restoring your water pressure to normal levels. 4. Running Toilets Problem: A running toilet can waste a lot of water, usually caused by a faulty flapper, fill valve, or overflow tube. DIY Fix: Inspect Flapper: Check the flapper to see if it’s worn or misaligned. If it's not sealing correctly, water will continuously flow into the toilet bowl. Replace the flapper if necessary. Adjust Fill Valve: Ensure the fill valve functions correctly and adjust the float arm if the water level is too high or too low. Replace Overflow Tube: If the overflow tube is cracked or damaged, it must be replaced. When to Call a Professional: If you’ve replaced the flapper and adjusted the fill valve, but the toilet still runs, a more complex issue may require professional attention. Conclusion While many common plumbing problems in San Diego can be fixed with a bit of DIY effort, some issues require the expertise of a professional plumber. Knowing when to tackle a problem yourself and when to call in a pro can save you time, money, and frustration. If you’re ever in doubt, don’t hesitate to contact a reliable San Diego plumbing service to ensure your home’s plumbing system remains in top condition.
18 Jun, 2024
Welcome to the world of home plumbing! This guide is designed to help you understand the basic layout and components of your home's plumbing system. Whether you're a new homeowner in San Diego or someone interested in home maintenance, knowing plumbing basics can help you manage minor repairs, make informed decisions, and communicate effectively with professionals when needed.
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