Garbage Disposals Installation Guides

Connecting a dishwasher drain line to a garbage disposal is a quick job, but doing it wrong causes one of the most common kitchen plumbing complaints we see: dirty water backing up into the dishwasher. The fix is simple -- you just need the right connection method and a high loop or air gap to prevent backflow.

Adding a disposal to a sink that never had one is a bigger job than a simple replacement, but still very doable. The extra steps: installing the mounting assembly and sink flange, connecting to the existing drain, and getting power to the unit. The plumbing side is straightforward. The electrical side -- running a new circuit or adding a switch -- is where most people decide to call in help.

The electrical side of garbage disposal installation trips up more homeowners than the plumbing side. It's not complicated, but there are code requirements that matter -- for safety and for passing inspection if you sell the house. Here's what you actually need to know.

Replacing a garbage disposal is one of the fastest plumbing upgrades you can do. If the new unit uses the same mounting system as the old one, you can have it swapped in 30 minutes. Even with a different mount, it's still under an hour. The electrical connection is just three wires in a junction box -- nothing complicated.