Comparison Laufen Kartell 812331 420 mm vs Laufen Pro 812962 420 mm

The overflow is a special opening located at the top of the shell. It prevents the transfusion of water over the edge: reaching the overflow, water through a special hose enters the drain pipe, which saves the bathroom from the «flood». Such a hose may be part of the wash basin, but most often it has to be purchased separately.

Note that overflow is designed for situations when the drain itself is closed (for example, by plugging); but if the drain is clogged lower (for example, in a siphon), this function will be useless - the water will still have nowhere to go from the filling shell. And therefore, the presence of overflow in the design of the wash basin does not eliminate the need to monitor the state of the sewer.