Dead line
As Totleitung one is water pipe called, mostly for subsequent retrofitting with fittings was moved and is not used.
Function and dangers
The pipe is not used and is provided with a lock in the wall / floor to prevent water from escaping. Lines are often no longer needed after changes to the pipe system, but are still connected and filled with water. Standing water or stagnant water is in terms of physical, chemical and biological processes a problem for drinking water supplies . Since the water in the dead pipes stagnates, it can become a breeding ground for microorganisms such as Legionella . Some of it is washed out into the drinking water system by the water flowing past.