Leaky siphon: how to fix it?


Have you noticed a leak in the siphon of your washbasin, basin or sink? It must be said that this type of problem is really unpleasant, because with each use, it is flooding in the kitchen or the bathroom. Before you condemn your sink and find the contact details of an emergency plumber, you can intervene yourself to repair the leak. Here are our tips on how to get there.

Why is a siphon leaking?

There are many reasons why a siphon suddenly starts to leak. Although this type of leak is painful, it is not of major gravity, in particular because the leak is not continuous. It only occurs when you turn on the water, which doesn’t cause as much damage as a pierced water inlet line. However, you have to act and identify the cause of the leak first, if possible.

Here are the main reasons:

  • A badly tightened siphon : over time, PVC pipes expand, especially under the effect of water temperature variations. The siphon can thus loosen slightly, which causes a slight leak. This is usually the most common reason and only requires simple tightening.
  • Poorly screwed nuts : if you have disassembled your siphon, in particular to clean it or unblock it, the nuts may have been incorrectly screwed in, which may cause a leak. Likewise, PVC can expand under the effect of temperature variations. In all cases, all you have to do is unscrew the nuts and screw them back straight to stop the leak.
  • The seal is worn : over time, the seals of the siphon wear out and crack. Leaks appear because they are no longer able to perform their function. In this case, it suffices to replace the defective seal with a new one of the same model.
  • A misplaced seal : if you have disassembled your siphon to clean it or unclog it, you may have moved the seal by screwing it back on. When he is dislodged from his location, he can no longer perform his duties. In this case, unscrew the siphon again, replace the seal correctly and screw the siphon back on.
  • The defective conical seal : the siphon is connected to the drain pipe by the nut. However, sealing is ensured by the fact that the latter presses a conical seal. When this conical seal is worn, it can cause a leak. It is then sufficient to replace it.

How to fix a leaky siphon?

Here you are in front of your leaking siphon. Here are the steps to fix it.

Step 1: locate the leak

If the leak is not clearly visible, run your finger over the siphon at the various fittings until it is wet.

Step 2: Tighten the siphon nuts

Before embarking on more complex repairs, simply retighten the nuts on your siphon. It may simply be a loosening that lets a little water through. Once the nuts are tight, run a little water and see if the leak persists. If it broke off, stop there. Otherwise, continue.

Step 3: replace the gaskets

If the leak persists, unscrew the siphon after placing a basin underneath, for safety. Do this by hand if possible or with the help of water pump pliers after placing a rag around the nut to protect it.

Clean all the components of the siphon and remove the defective gaskets. Replace them with new identical models then reassemble the siphon. Finally, tighten well.

Run some water to make sure the leak is repaired. However, if it persists again, it may be a good idea to call a professional or disassemble your siphon and go to a DIY store to replace it with an identical model. It can in fact be split without this being clearly visible.

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