How to fix the sink drain pipe

Kitchen sink: drain and overflow

Parts of the sink drain

Unlike wash basins, sinks usually have a plug drain. This means that the drain valve also looks a little different. In addition, a sink almost always has a separately connected overflow.

So the basic parts of the sink drain are:

  • Drain valve set
  • Drain pipes and siphon
  • Overflow

Waste set

The drain set is in two parts in the kitchen sink. The sieve of the plug drain is above (i.e. inside the kitchen sink). Underneath there is a kit ring for sealing.

The second part of the drain valve is located below the sink. This part of the process is also sealed separately in turn. The seal is located above. The upper part and the lower part are firmly connected to one another with a screw. It is important here that the lower seal in particular is intact, otherwise the sink will drip.

Drain pipes and siphon

The immersion pipe goes first to the siphon. It is connected to the siphon with a normal union nut connection, as usual there is a wedge seal inside. The immersion pipe can also have one or two additional connections via which devices can direct their waste water directly into the drain (e.g. dishwasher or washing machine). These connections are only closed with simple rubber plates. If they are removed, the connection can be used.

The waste water pipe leads to the wall connection below the siphon. It can also be designed as a flexible tube.


Each sink has a separate overflow. The overflow valve is firmly connected to the overflow opening of the sink with a screw. In between there is a seal.

The overflow pipe then makes a bend and leads to the lower part of the drain valve, where it is inserted into the drain valve and secured with a union nut. Here, too, there is clearly a seal inside the union nut.

Clean the drain

Food residues and grease can often get into the drain from the sink. To prevent this from happening, use a strainer that you place on the stopper valve when water drains out. If the drain has clogged due to the greasy rinse water and residues, you can simply open it again with a suction bell ("Pömpel") or a spiral pipe.

Drain cleaners, on the other hand, are dangerous chemicals that can not only be harmful to health, but also cause great damage to the environment and water bodies. Avoid these products, especially the granules, as much as possible. There are also gentler means of cleaning drains.

The assembly of the drain is done in the following order: First assemble the drain valve, then install the siphon, then assemble the overflow. Make sure that all parts sit correctly on each other and that the seals do not tilt. Always tighten hand-tight.

Author: Johanna Bauer Home »Living» Kitchen »Sink