Hetmann which one is to actually say more. Best lubrication and operating characteristics of the valves and the otherwise different oils eg for the Miniballinkage and other versions of the rotary valves. The valves of the pump is the name Hetmann a term. Best running characteristics even at lower temperatures when playing outdoors. The valves operate smoothly with normal cold temperatures. You smear not be not stiff or zählaufend. Even after prolonged non-use of the instrument is seizing the valves unlikely. This does not mean that this will not happen with a long service life. Otherwise Highly recommended! I'm always gone well so far and more than 15 years Damir was very satisfied.
