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Prepare the Locking Flange — Install the New Garbage Disposal

Beginner3 hours

Part of project

Replace Your Garbage Disposal: Step-by-Step Guide · Step 4 of 5

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Before installing the new disposal, check the position of the locking flange. It often comes seated in a lower groove from the factory. You must push and spin this flange upwards until it sits flush against the top rubber washer. This is crucial for the disposal to be able to mount correctly to the sink.

Goal: Adjust the locking flange for easier mounting

  • The disposal is heavy (20-30 lbs), making it difficult to lift and mount if the flange is not pre-adjusted.
  • It is much easier to adjust the flange before you are under the sink holding the heavy unit.
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FAQs

Is replacing a garbage disposal truly a beginner project, and what might make it take longer than 3 hours?

While rated beginner, unexpected issues like rusted pipes or a stubborn old mounting ring can extend the time significantly. Having the right tools, a clear workspace, and pre-reading your new disposal's manual will help keep it on schedule. If you encounter major plumbing issues or complex electrical wiring, consider calling a professional.

Beyond the listed tools, are there any other materials or tools I might need for a smooth installation, like plumber's putty?

Yes, plumber's putty is essential for creating a watertight seal for the new sink flange. Electrical tape might be needed for secure wire connections if your new disposal requires hardwiring. A good flashlight will also be invaluable for working in the dark cabinet under the sink.

What crucial safety precautions, beyond turning off the power, should I absolutely follow during this replacement?

Always double-check the power is off at the disposal outlet and the breaker before starting. Wear safety glasses to protect from debris and sturdy gloves, especially when handling tools or old components. Be mindful of the disposal's weight; it can be heavier than expected, so support it properly to avoid injury.

My new disposal is leaking after installation. What are the most common leak points I should check first?

The most common leak points are the mounting ring connection to the sink flange, the discharge pipe connection to the disposal, and the dishwasher inlet plug (if applicable). Ensure all bolts are tightened securely, the plumber's putty has a good seal, and hose clamps are firm. Avoid overtightening plastic fittings, as they can crack.

Transcript
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Similarly, when I was installing, this is the old one that I've removed. When I was installing a new one, this flange here that came with the disposal was actually in the bottom here. It was in the bottom layer. And no matter how much force I used to push it up, it actually wouldn't go up. I had to spin it and sort of push it up. And the reason why that's important is this thing is about 20, 30 pounds. And when you're underneath the sink and you're trying to get this notch here to go along this rail, to go along this first rail and then twist it on tight to the point where it seats here. It actually is very cumbersome and it's very heavy. So if you don't have this pushed all the way up, then you'll never get it to see even on the first, even on the very first edge here. So just make sure before you go under the sink and before you try to get it to hang on these rails here, to use some force to push this all the way up. As high as it can go, almost flush to where this flexible rubber thing is, what rubber washer is. So just make sure you do that.

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