Moin, have a problem with my Ommi (permanent construction site but it will …), I get the hose (which leads over the connection tube to the heat exchanger) no longer securely attached. The ring, e.g. the white one can not move forward even after several persuasion attempts to be secured. Tube is fully pushed forward and one also hears a ‘click’ so that it is assumed that the cut-out at the patent closure has also slipped over the bulge on the tube. In any case, g can no longer be moved to the rear even after pressing down the rest … Questions are now: Why does the ring of the hose not move in removed / withdrawn condition, is the (green) transport securing possibly necessary for the installation? Or defective hose coupling…, too little bread .. 🙂 ? Furthermore, I have the question whether there is still an O-ring inside the connection? At any rate, there was nothing to be seen at a later hour. -Catalogue is also nothing … heat exchanger connector