Connect Drain Plumbing — Connect Water Supply Lines and Drain
Part of project
How to Install a Bathroom Sink and Faucet from Start to Finish · Step 4 of 5
In this video
From underneath the sink, connect the rest of the drain plumbing. First, ensure the gasket is in place inside the slip nut for the drain tailpiece. Thread the tailpiece onto the bottom of the strainer body and tighten the slip nut using adjustable joint pliers. Next, ensure the P-trap washer is in place and connect the P-trap to both the tailpiece and the waste pipe in the wall. Tighten all slip nut connections with the adjustable joint pliers until they are snug.
Goal: Attach the sink drain to the household waste pipe system
- Hand-tighten the plastic slip nuts first, then give them a final quarter-turn with pliers. Over-tightening can crack the nuts or damage the threads.
Used in this video
- Adjustable Joint Pliers (Tool Type: Plumbing Tools, Power Source: Manual, Wrench Type: Adjustable wrench) — Tightening the large slip nuts that connect the tailpiece and P-trap.
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FAQs
How difficult is this bathroom sink and faucet installation for a beginner, and how much time should I set aside?
This project is categorized as 'beginner' difficulty, making it very approachable for DIYers. For a first-timer, plan to dedicate 4-6 hours from start to finish, including preparation and cleanup. Rushing can lead to mistakes, so allow extra time for unexpected issues.
What are the most critical safety steps I need to take before starting to remove the old sink and work on plumbing?
The absolute most critical step is to shut off the water supply to the sink, either at the shut-off valves under the sink or the main water supply to your house. Also, place a bucket and towels under the work area to catch any residual water, and consider wearing safety glasses when using tools or working with pipes.
Is a basin wrench, like the TEKTON WRN92004, truly necessary for this project, or can I use regular pliers?
While you might be able to manage with large channel-lock pliers in some cases, a basin wrench (e.g., TEKTON WRN92004) is highly recommended. It's specifically designed for reaching and loosening the difficult-to-access mounting nuts on faucets, especially in tight spaces, making the job significantly easier and faster.
What's the most common mistake beginners make when installing the drain assembly or sealing the sink, and how can I avoid it?
A common mistake is either not using enough plumber's putty (like Oatey 14 oz. Plumber's Putty) around the drain flange, or over-tightening plastic drain fittings, which can crack them. Ensure a generous, even ring of putty under the drain flange for a watertight seal, and hand-tighten plastic connections, then give a quarter-turn with pliers, being careful not to overtighten.
Connect Drain Plumbing — Connect Water Supply Lines and Drain
Part of project
How to Install a Bathroom Sink and Faucet from Start to Finish · Step 4 of 5
In this video
From underneath the sink, connect the rest of the drain plumbing. First, ensure the gasket is in place inside the slip nut for the drain tailpiece. Thread the tailpiece onto the bottom of the strainer body and tighten the slip nut using adjustable joint pliers. Next, ensure the P-trap washer is in place and connect the P-trap to both the tailpiece and the waste pipe in the wall. Tighten all slip nut connections with the adjustable joint pliers until they are snug.
Goal: Attach the sink drain to the household waste pipe system
- Hand-tighten the plastic slip nuts first, then give them a final quarter-turn with pliers. Over-tightening can crack the nuts or damage the threads.
Used in this video
- Adjustable Joint Pliers (Tool Type: Plumbing Tools, Power Source: Manual, Wrench Type: Adjustable wrench) — Tightening the large slip nuts that connect the tailpiece and P-trap.
Frequently Asked Questions
How difficult is this bathroom sink and faucet installation for a beginner, and how much time should I set aside?
This project is categorized as 'beginner' difficulty, making it very approachable for DIYers. For a first-timer, plan to dedicate 4-6 hours from start to finish, including preparation and cleanup. Rushing can lead to mistakes, so allow extra time for unexpected issues.
What are the most critical safety steps I need to take before starting to remove the old sink and work on plumbing?
The absolute most critical step is to shut off the water supply to the sink, either at the shut-off valves under the sink or the main water supply to your house. Also, place a bucket and towels under the work area to catch any residual water, and consider wearing safety glasses when using tools or working with pipes.
Is a basin wrench, like the TEKTON WRN92004, truly necessary for this project, or can I use regular pliers?
While you might be able to manage with large channel-lock pliers in some cases, a basin wrench (e.g., TEKTON WRN92004) is highly recommended. It's specifically designed for reaching and loosening the difficult-to-access mounting nuts on faucets, especially in tight spaces, making the job significantly easier and faster.
What's the most common mistake beginners make when installing the drain assembly or sealing the sink, and how can I avoid it?
A common mistake is either not using enough plumber's putty (like Oatey 14 oz. Plumber's Putty) around the drain flange, or over-tightening plastic drain fittings, which can crack them. Ensure a generous, even ring of putty under the drain flange for a watertight seal, and hand-tighten plastic connections, then give a quarter-turn with pliers, being careful not to overtighten.