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How to Connect a Bathroom Sink to Drain Pipe

After continued use, bathroom sinks may need some minor repairs, which may involve taking apart the drain assembly. The bathroom sink will eventually need to be attached to the drain pipe when you are done with the repairs. It is possible to connect the drain pipe to the sink yourself with a few basic materials. This will save you cash in the long run, rather than hiring a plumber.


Connect your own pipes.
  1. Turn off the water supply to the sink by flipping the water valve under the sink with your hand before you begin any work.
  2. Attach the drain pipes by feeding the drain section of the pipe into the opening at the base of the sink bowl. Use the pipe wrench to screw on the nut and to secure the next straight pipe.
  3. Add the "J" pipe or the trap by attaching this with a pipe wrench to the last pipe you installed. Connect the last curved piece to the "J" pipe with the wrench. Secure this pipe to the drain outlet in the wall and use the wrench to tighten the nut.
  4. Attach the bar in the pop-up stopper in the sink if you had one. Make sure the pipe connections are tight. Re-tighten with the pipe wrench if necessary, but do not over tighten. Try using Teflon tape, the thin white tape that plumbers use to wind around the threaded ends of pipes, which will help increase the water tightness of a joint. Only use this tape on metal pipes that are threaded and not on PVC pipe. Apply the tape by holding the end of the tape against the pipe threads, flush with the end of the pipe. Rotate the pipe clockwise and apply one to two layers of tape on the pipe. Make sure you keep the tape flat and tight against the pipe, while you are rotating it. After you are finished applying the tape, thread the pipe into the fitting. Begin with two loops of tape around the end of the pipe then cover all the threads, overlapping half the width of the tape on each turn. Wrap in the same direction as the threads.
  5. Turn the water back on by flipping the switch underneath the sink. Run the water and check to see if there are any leaks.

Things You Will Need

  • Pipe wrench
  • PVC or metal drain pipe kit
  • Teflon tape (optional)

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