Down the sink drain is where the water should go.
The water must go somewhere when you use your bathroom sink and down the drain is the preferred route. Sometimes pipes leak because they are old and they may need to be replaced. It is possible to replace the bathroom sink drain pipe yourself with a few basic materials. It will save you cash in the end to fix the sink drain pipe yourself without hiring a professional.
Instructions
1. Purchase a PVC pipe kit and trap from the local hardware store to replace the bathroom sink drain pipe.
2. Shut off the water supply before you begin working. Do this by turning the water valve, which is located under the sink.
3. Remove the old drain pipes that connect the drain line to the bottom of the sink by loosening the nut with adjustable pliers. Unfasten the bar on the pop up stopper if your sink has one. Unscrew the nut that connects the pipe at the wall with the adjustable pliers. Hold the pipe assembly with your other hand so it does not fall and spill its contents. Place a bucket below the pipe, in case water falls out.
4. Measure the new pipes against the old ones. Use a hacksaw if you need to cut some of the pipes down to make them fit. Connect the sections of your drain assembly and cover the edges of the pipes with Teflon tape to prevent any leaks. Use about two or three layers of the tape at each pipe connection.
5. Connect the drain by re-attaching the pipes in the opposite order that you removed them. Attach the wall side first and end at the sink. Tighten the nuts with the adjustable pliers, but do not over tighten. Replace the bar in the pop-up stopper if you disengaged it. Make sure you can raise and lower the stopper.
6. Turn the water back on by flipping the water valve to test the drain. Run the cold water and make sure there are no leaks. Plug the sink with the stopper and let the sink fill about to about one-third full. Open the drain and make sure there are no leaks. Leave a bucket under the sink for a few days and make sure there are no leaks. If there are, you may need to add more Teflon tape.
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