Filling system for a Narkosemittelverdunster

A filling system for a Narkosemitteldosierer to be improved in terms of anesthetic-specific coding. To achieve the object, it is provided that the adapter neck of the bottle adapter polygonally arranged outer surfaces (7, 71) as an anesthetic specific coding owns and a filling device for an anesthetic at Narkosemitteldosierer has a filler neck for receiving the adapter neck, and polygonally arranged inside surfaces (27, 271) as an anesthetic specific trained coding on the filler neck, which are designed to correspond to the outer surfaces (7, 71), wherein at least an inner surface (271) has a protruding from the inner surface projection (272) and at least one outer surface (71) a corresponding to the projection (272) recess (72).