Install the New Basket Strainer — Install Faucet and Strainer on the Sink
Part of project
How to Install an Undermount Kitchen Sink · Step 3 of 10
In this video
Insert the new strainer into the sink's drain hole from above and press down firmly. This will cause the excess plumber's putty to squeeze out around the edges. From underneath the sink, slide the rubber gasket up against the sink bottom, followed by the paper washer, and then the large locknut. Hand-tighten the locknut as much as possible. Then, using channel-lock pliers, tighten the locknut securely. Hold the strainer from inside the sink to prevent it from spinning as you tighten.
Goal: Set the new strainer and its components in place
- The correct order for the washers is critical: rubber gasket against the sink, then the paper (or friction) washer, then the metal locknut. This prevents the rubber gasket from twisting and bunching up.
Used in this video
- Channel-Lock Pliers (brand: N/A, Tool Type: Pliers, Pliers_Type: Channel-Lock) — Tightening the locknut on the new basket strainer.
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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.
Install the New Basket Strainer — Install Faucet and Strainer on the Sink
Part of project
How to Install an Undermount Kitchen Sink · Step 3 of 10
In this video
Insert the new strainer into the sink's drain hole from above and press down firmly. This will cause the excess plumber's putty to squeeze out around the edges. From underneath the sink, slide the rubber gasket up against the sink bottom, followed by the paper washer, and then the large locknut. Hand-tighten the locknut as much as possible. Then, using channel-lock pliers, tighten the locknut securely. Hold the strainer from inside the sink to prevent it from spinning as you tighten.
Goal: Set the new strainer and its components in place
- The correct order for the washers is critical: rubber gasket against the sink, then the paper (or friction) washer, then the metal locknut. This prevents the rubber gasket from twisting and bunching up.
Used in this video
- Channel-Lock Pliers (brand: N/A, Tool Type: Pliers, Pliers_Type: Channel-Lock) — Tightening the locknut on the new basket strainer.
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.