Leaking siphon : how to repair 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 condemning your sink and looking for the contact details of a plumber available in an emergency, you can intervene yourself to repair the leak. Here are our tips for doing just that.

Why does a siphon leak?

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 happens when you run the water, which doesn’t cause as much damage as a leaky water supply pipe. Nevertheless, it is necessary to act and start by identifying the cause of the leak, if possible.

Here are the main reasons:

  • A loose siphon : over time, PVC pipes expand, especially under the effect of differences in water temperature. The siphon can thus loosen slightly, which leads to a slight leak. This is usually the most common reason and only requires a simple tightening.
  • Loose nuts : if you have dismantled your siphon, in particular to clean it or unclog it, the nuts may have been screwed on incorrectly, which may cause a leak. Similarly, PVC can expand under the effect of temperature differences. In any case, all you have to do is unscrew the nuts and screw them back in straight to stop the leak.
  • The gasket is worn : over time, the seals of the siphon wear out and crack. Leaks appear since they are no longer able to fulfill their function. In this case, simply replace the defective seal with a new one of the same model.
  • A misplaced seal : if you have dismantled your siphon to clean it or unclog it, it is possible that by screwing it back on, you have moved the seal. When he is dislodged from his location, he can no longer perform his duties. In this case, unscrew the siphon again, replace the gasket correctly and screw the siphon back on.
  • The faulty cone 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 joint. When this conical seal is worn, it can cause a leak. Then just replace it.

How to repair a leaking siphon?

Here you are facing your leaky 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 trap at the various fittings until it is wet.

Step 2: Tighten the siphon nuts

Before embarking on more complex repairs, simply tighten the nuts on your trap. It may simply be a loosening that lets a little water through. Once the nuts are tightened, run some water and see if the leak persists. If it has stopped, stop there. Otherwise, continue.

Step 3: Replace seals

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

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

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

Leave a Comment