Remove Old Garbage Disposal — Install the Garbage Disposal
Part of project
How to Install an Undermount Kitchen Sink · Step 7 of 10
In this video
With the plumbing disconnected, you can remove the disposal unit itself. First, support the unit from underneath with your hands, a bucket, or a block of wood, as it is heavy. Locate the metal mounting ring at the very top of the disposal, where it connects to the sink flange. Grip the ring or its tabs and rotate it counter-clockwise. This will unlock the disposal from the mount. Once unlocked, carefully lower the unit and remove it from under the sink.
Goal: Detach and remove the disposal unit
- If the ring is stuck, you can insert a screwdriver into one of the tabs for extra leverage to help turn it.
Used in this video
- Bucket or Wood Block (Tool Type: Bucket) · optional — Supporting the heavy garbage disposal unit during removal and installation.
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FAQs
Is installing an undermount kitchen sink truly an intermediate DIY project for a novice, given the 8-hour estimate?
While listed as 'intermediate' with an 8-hour estimate, the project involves critical plumbing connections, working in tight spaces, and precise sealant application, which can be challenging for beginners. If you're not confident with plumbing or power tools like a drill, consider hiring a professional for specific steps or the entire installation to avoid potential issues like leaks.
What are the most crucial specialized tools I'll need for this undermount sink installation, beyond basic household items?
Key specialized tools include adjustable and tongue and groove pliers (like the Channellock 430) for securing plumbing connections, and a reliable drill for installing the mounting clip anchors. A putty knife is essential for working with plumber's putty, and a good flashlight (like the NITECORE P20iX) will be invaluable for inspecting connections in dimly lit cabinet spaces.
What are the most common reasons for leaks after an undermount sink installation, and how can I prevent them?
Leaks typically occur due to insufficient sealant around the sink's rim, improperly tightened drain or water supply connections, or issues with the garbage disposal seal. Ensure a continuous, even bead of sealant when mounting the sink, hand-tighten plumbing connections first then give a quarter to half-turn with a wrench, and double-check all gaskets during assembly.
The project mentions Oatey Plumber's Putty; can I use 100% silicone sealant instead for mounting the sink to the countertop?
Yes, 100% silicone sealant is often preferred for undermount sinks, especially with stone countertops, as it creates a stronger, more permanent, and flexible waterproof bond than plumber's putty. While plumber's putty is excellent for sealing drains and strainers like the KRAUS Kitchen Sink Strainer, silicone offers enhanced long-term durability for the sink-to-countertop seal.
Remove Old Garbage Disposal — Install the Garbage Disposal
Part of project
How to Install an Undermount Kitchen Sink · Step 7 of 10
In this video
With the plumbing disconnected, you can remove the disposal unit itself. First, support the unit from underneath with your hands, a bucket, or a block of wood, as it is heavy. Locate the metal mounting ring at the very top of the disposal, where it connects to the sink flange. Grip the ring or its tabs and rotate it counter-clockwise. This will unlock the disposal from the mount. Once unlocked, carefully lower the unit and remove it from under the sink.
Goal: Detach and remove the disposal unit
- If the ring is stuck, you can insert a screwdriver into one of the tabs for extra leverage to help turn it.
Used in this video
- Bucket or Wood Block (Tool Type: Bucket) · optional — Supporting the heavy garbage disposal unit during removal and installation.
Frequently Asked Questions
Is installing an undermount kitchen sink truly an intermediate DIY project for a novice, given the 8-hour estimate?
While listed as 'intermediate' with an 8-hour estimate, the project involves critical plumbing connections, working in tight spaces, and precise sealant application, which can be challenging for beginners. If you're not confident with plumbing or power tools like a drill, consider hiring a professional for specific steps or the entire installation to avoid potential issues like leaks.
What are the most crucial specialized tools I'll need for this undermount sink installation, beyond basic household items?
Key specialized tools include adjustable and tongue and groove pliers (like the Channellock 430) for securing plumbing connections, and a reliable drill for installing the mounting clip anchors. A putty knife is essential for working with plumber's putty, and a good flashlight (like the NITECORE P20iX) will be invaluable for inspecting connections in dimly lit cabinet spaces.
What are the most common reasons for leaks after an undermount sink installation, and how can I prevent them?
Leaks typically occur due to insufficient sealant around the sink's rim, improperly tightened drain or water supply connections, or issues with the garbage disposal seal. Ensure a continuous, even bead of sealant when mounting the sink, hand-tighten plumbing connections first then give a quarter to half-turn with a wrench, and double-check all gaskets during assembly.
The project mentions Oatey Plumber's Putty; can I use 100% silicone sealant instead for mounting the sink to the countertop?
Yes, 100% silicone sealant is often preferred for undermount sinks, especially with stone countertops, as it creates a stronger, more permanent, and flexible waterproof bond than plumber's putty. While plumber's putty is excellent for sealing drains and strainers like the KRAUS Kitchen Sink Strainer, silicone offers enhanced long-term durability for the sink-to-countertop seal.