I'm just experiencing an issue with water tank in our 20-30 old years old house (Czech rep. for location reference). I have studied type of expansions on Internet for (few hours) + visited shop with toilets and I was unable to find same model/type of
output ventil (unsure about name) from the tank.
There is pipe coming from the bottom hole, whene You pull the string, it will take the top of tube and put it under the water surface/level.
How I imagine it: http://imgur.com/a/xvBG3
The leak itself goes from water tank to the toilet (through its normal path).
Questions: Have You seen anyone this system somewhere? Where the leak might come from? Could You provide "name" or "brand" for this type of tank to find spare parts?
Thanks in advance.