Replacing Drain Pipes Under Bathroom Sink

Replacing Drain Pipes Under Bathroom Sink: A Comprehensive Guide

Replacing drain pipes under a bathroom sink is a plumbing task that requires some basic knowledge and skills. Whether you're experiencing leaks, clogs, or corrosion, it's essential to address these issues promptly to prevent further damage. This comprehensive guide will provide you with a step-by-step approach to successfully replace drain pipes under your bathroom sink.

Required Tools and Materials

Before starting, gather the necessary tools and materials:

Adjustable wrench
Plumber's putty
Teflon tape
Slip joint pliers
Bucket
New drain pipes (matching the size and type of the existing ones)
Basin wrench (optional)
Flashlight (optional)

Safety Precautions

Take the following safety precautions before starting:

Turn off the water supply under the sink.
Wear work gloves and eye protection.
Place a bucket under the sink to catch any water.
Open a window for ventilation if using any chemical cleaners.

Step-by-Step Guide

1. Remove the Old Drain Pipes

Use an adjustable wrench to loosen and remove the nuts connecting the drain pipes to the sink drain and the p-trap. Disconnect the pipes carefully and discard them.

2. Clean the Drain Opening and P-Trap

Use a rag or brush to remove any debris or old putty from the sink drain opening and the p-trap. Wipe them clean with a wet cloth.

3. Apply Plumber's Putty

Roll out a small piece of plumber's putty into a rope and apply it around the base of the new sink drain (the part that goes into the drain opening). Make sure the putty is smooth and even, creating a watertight seal.

4. Install the New Sink Drain

Align the new sink drain with the drain opening and insert it carefully. Tighten the drain nut by hand and then use an adjustable wrench to fully secure it. Do not overtighten.

5. Wrap Teflon Tape

Apply Teflon tape in a clockwise direction around the threads of the p-trap connector that will connect to the sink drain. Wrap it tightly, overlapping each layer slightly for about 3-4 turns.

6. Install the P-Trap

Connect the p-trap to the sink drain by hand-tightening the connector. Use slip joint pliers to further tighten it, ensuring a snug fit but being careful not to damage the plastic parts.

7. Connect to the Drain Pipe

Connect the other end of the p-trap to the drain pipe using the same technique as in step 6. Tighten the connection securely.

8. Test for Leaks

Turn on the water supply and let the water run through the sink for a few minutes. Check for any leaks at the connections. Tighten any loose connections as needed.

Tips

If you encounter any stubborn nuts, use a penetrating lubricant to loosen them.
Use a flashlight to inspect hard-to-reach areas for corrosion or damage.
If you're replacing a metal drain pipe, consider replacing it with a flexible plastic pipe, which is less likely to corrode or clog.
If you're unsure about any step, consult a qualified plumber for assistance.

Conclusion

Replacing drain pipes under a bathroom sink can be a challenging task, but it's manageable with the right tools, materials, and a systematic approach. By following the steps outlined in this article, you can effectively replace your drain pipes and restore the proper functioning of your bathroom sink.