How To Repair a Siphon in the Drain of a Kitchen Sink

Cleaning and repairing a drain under the sink is relatively simple in both premise and repair. The siphons are curvatures in plumbing, because of its shape, retain a small amount of water all the time. This water creates a seal that prevents sewer gases from entering your house. Modern houses commonly use two siphons (the “P” and the “S”). Siphon P connects to the wall drain, but Siphon S flows through the drainage of the floor. If you find a loss of water or you simply have to clean a lock, remove the siphon and replace it is an easy repair.


  1. Drain the water in your kitchen sink and clean the area under the sink, if necessary. You should leave space to work.
  2. Locate the water cut and close it. You probably have a round knob on the water line under your sink or you may have to close the water supply at the source.
  3. Place a bucket or large container directly under the part of the siphon that you are removing. The water that is contained in your siphon can easily drain into the bucket while you are taking it away, rather than falling on your head or closet.
  4. Loosen the cuticles at either end of the siphon (leading to the sink and drain spout on the wall). These couples are large, circular rings that are wider than the pipe to which they are attached. Turn the cuticles counterclockwise to remove them. Use a wrench or similar tool to loosen them if the connections do not rotate easily.
  5. Release siphon from basin spout and drain, loosening the connection in the center of the siphon to manipulate the adjusted area, if necessary. Let the water drain out of the siphon before you completely remove it from your workplace, if you are replacing the siphon or you are cleaning the siphon and the surrounding pipes. Reconnect the couples, screwing them back in place, if you simply have a loss and you must re-secure the accessories.
  6. Build your new siphon P if you are replacing the parts. You can buy P-siphons as a game, with all the necessary parts. Simply place the pieces together to reassemble the old siphon.
  7. How to Repair a P Siphon in the Drain of a Kitchen Sink
  8. Test your drain to see if you have losses before declaring the work complete.
  9. Raise the new siphon in place, or the old one if you cleaned a drain lock in your kitchen. Adjust the siphon as necessary to fit in place correctly. Leaving half of the loose cuticles when you install the entire siphon could help you get into the place more easily. Make sure that the siphon feels “natural” in its position (an uncomfortable installation where the siphon does not stay in place alone will trigger losses and faults). Adjust the couples by hand when the siphon is in place.
  10. Open the water supply, then fill the kitchen sink with water. Drain once it is full, checking for leaks as water escapes. The downward pressure of leaking water will expose a faulty installation. Repeat steps as necessary to achieve leak-proof repair.

Tips & Warnings

  • Open the faucets in the sink after closing the water supply to make sure there is no water left and to know that it cannot run when you are working. Although this is not strictly necessary it can avoid a big mess.
  • In some installations, the pipe of your siphon may be of a larger diameter than that of your basin or drain pipe. Add a transition basket to compensate for that difference.
  • You may also need to cut your siphon if the pipe is too long or add a slip joint to extend your siphon installation. Cut with a hand saw and proceeds normally or ensures the connection of the siphon to the plumbing with a cupla.
  • Check the building codes for your area; always replace S siphons with P siphons if possible but never reverse.
  • Do not stick the parts in place; however, the threads of the pipes can be wrapped with Teflon tape to create a better seal.
  • It passes from plastic to metal pipes using slip joints.