Sink leaking - what to do?

When it drips under the sink, it is time to act unconditionally. What can be done in detail, how to find the damaged spot, and what measures to remedy, read in detail in this post.

Possibly leaks

Under the kitchen sink, it is above all the connections in the wastewater system that can be problematic. In particular there are connections:

  • between sink and lower part of drain valve
  • between drain valve and immersion tube
  • at the lateral connections of immersion tube (if not used, then closed with rubber plates)
  • between immersion tube and siphon
  • between siphon and sewage pipe

Also the wall connection can a problem. Here are the wet spots then clearly visible on the wall. If this is the case, be sure to consult an installer, as it may theoretically be leaking inside the wall, not just the connection.

Visual inspection

With a little patience, you can find out where your drainage system is leaking. Carefully dry the entire drainage system with a rag. Then pour more water into the sink and let it drain. Now, as you observe the drainage system, you can see exactly where drops of water are forming.

It can be a bit easier if you use colored liquid - such as the liquid from a beetroot glass. Here, at the exit point of the liquid, clearly red traces would form - the dense area above it remains clean.

Eliminating the leak

As a basic measure, you should disassemble and reassemble all joints. Check the seals for proper seating and watch for any obvious damaged seals. You can also replace gaskets completely. As a rule, the purchase of a new waste fitting will pay off here (with plastic).

Tips & TricksWhen handling the water pipe leading into the wall connection, you should be very careful. Never pull the pipe forcibly and do not push it back into the wall with excessive force. The compound can be very sensitive, especially in drywall walls.
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