Replacing a garbage disposal is a straightforward job that takes about an hour. If your current unit leaks, jams constantly, or just stopped working, a new one can be swapped in with basic tools.
STEP 1: Disconnect Power and Remove the Old Unit
Turn off the circuit breaker for the disposal. Unplug it or disconnect the hardwired connection inside the bottom cover plate. Place a bucket under the unit, disconnect the drain pipe, then twist the disposal counterclockwise to release it from the mounting ring.
STEP 2: Check If You Can Reuse the Mounting Assembly
With the groundwork laid, if the new disposal is the same brand, the existing mounting ring and flange may be compatible — just twist the new unit on. If switching brands, remove the old mounting ring, snap ring, and flange from the sink drain and install the new ones that come with the replacement.
STEP 3: Connect the Dishwasher Inlet and Drain
Here is where the real progress begins. if you have a dishwasher, knock out the dishwasher drain plug inside the new disposal using a hammer and screwdriver. Attach the dishwasher drain hose to the inlet. Connect the discharge tube to the drain pipe using the provided gasket and clamp.
STEP 4: Wire the Electrical Connection
With the core work behind you, remove the bottom cover plate on the new disposal. Connect the black wire to black, white to white, and attach the green ground wire to the green screw. Secure connections with wire nuts and tuck the wires inside. Replace the cover plate.
STEP 5: Mount the Disposal and Test
To lock in your results for the long term, lift the disposal into position and twist it clockwise onto the mounting ring until it locks. Turn on the water, restore power at the breaker, and test the unit. Check all connections for leaks and run the disposal with cold water for 30 seconds.
PRO TIPS
Q: What size garbage disposal do I need for my household?
A: Buy the same horsepower or higher as your old unit. A 1/2 HP disposal handles a single person or couple. A 3/4 HP handles a family. A 1 HP handles heavy use and fibrous foods. Underpowered disposals jam constantly.
Q: Should you run hot or cold water with a garbage disposal?
A: Always run cold water — not hot — when using a disposal. Cold water solidifies grease so the blades can chop it up and flush it away. Hot water melts grease which then re-solidifies further down the pipe and creates clogs.
Q: How do I disconnect a garbage disposal for replacement?
A: Take a photo of all wiring and plumbing connections before removing the old unit. This makes reassembly foolproof and saves time troubleshooting which wire goes where.
SUPPLIES NEEDED
Replacement garbage disposal
Plumber’s putty
Screwdrivers (flathead and Phillips)
Wire nuts
Bucket and towels
Adjustable pliers
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