I'm very satisfied, even if I had Kokler. If you google something and how I - has already disposed of 2 - and then reads that one should simply remove with the Kokelnden heads the upper sealing ring ... So if you kokeln after a short time, remove sealing ring above. Some one also says that these things bubble - which I can not agree. I think Joytech is still a little polish to it, because in itself it is the person I like best!
