In 2013, Stop Silent Light check-valves were installed in the city network of Bern.
A huge backwater flap with a diameter of DN800 was installed in a pipe line of the city sewers. The valve, which can be installed in just a few minutes, was inserted into the existing pipe.
The non-return valve convinced and satisfied the city of Bern as it has been working reliably and sustainably since it was installed.