referring to the drawings in particular , fig1 shows as an example an anesthetic dispenser 21 with a filling device 20 for anesthetic . a reservoir 30 for liquid anesthetic is provided with a bottle adapter 1 , which has an adapter neck 5 . for the filling process the adapter neck 5 is inserted into the filling device 20 and the reservoir 30 is pressed in the direction of the filling device 20 . fig2 shows a perspective view of a bottle adapter 1 according to the state of the art , as disclosed in de 10 2004 063 883 b3 . the bottle adapter 1 has a threaded sleeve 2 on its bottom side for screwing onto the reservoir 30 ( fig1 ). the reservoir 30 has an anesthetic - specific index collar ( not shown in detail ), which is inserted into mounting grooves 3 of the threaded sleeve 2 . thus , only one bottle adapter 1 belonging to the anesthetic can be screwed onto the reservoir 30 . the screwing motion is hereby facilitated by means of recessed grips 4 above the threaded sleeve 2 . an adapter neck 5 with an o - ring 6 is located at the upper end of the bottle adapter 1 . the upper end of the bottle adapter 1 has an outer polygonal course 7 for anesthetic - specific coding as well as an outlet connection piece 8 with radially running slots 9 . the connection piece top side 10 is designed as a star - shaped body 11 . fig3 illustrates a bottle adapter 100 according to the present invention . identical components are provided with identical reference numbers of fig2 . the bottle adapter 100 has an outlet connection piece 80 with radially running slots 90 . a connection piece top side 110 includes a shaped body 111 . the fact that the shaped body 111 has a central opening 29 in the area of the connection piece surface 110 is different from the bottle adapter 1 according to fig2 . fig4 illustrates the filling device 20 in detailed sections . the filling device 20 has a filling connection piece 22 with a cylindrical sealing surface 23 and a lead - in bevel 24 for the o - ring of the bottle adapter 1 , 100 . with the bottle adapter 1 , 100 inserted , the o - ring 6 lies against the sealing surface 23 of the filling connection piece 22 . in the filling connection piece 22 is arranged an inner polygonal course 27 , which is designed corresponding to the outer polygonal course 7 of the bottle adapter 1 , 100 . on the inner wall of the filling connection piece 22 are fastened radially inwards directed rods 26 , which are designed as a spoked wheel 25 with a flange 28 mounted in the center . the rods 26 mesh with the slots 9 of the bottle adapter 100 according to the present invention and the flange 28 lies in the area of the opening 29 and is designed corresponding to the opening 29 in terms of diameter . when the reservoir 30 is pressed against the filling device 20 , a fill valve ( not shown in detail ) within the filling device is opened through the connection piece top side and the rods 26 bring about that an adapter valve ( not shown in detail ) in the bottle adapter 100 is opened , so that anesthetic can flow from the reservoir 30 into the anesthetic dispenser 21 . upon completion of the filling process , first the adapter valve closes , so that any residual amounts of anesthetic within the filling connection piece 22 can flow out into the tank of the anesthetic dispenser 21 . then the fill valve is closed and the bottle adapter 100 can be removed from the filling connection piece 22 . by contrast , the bottle adapter 1 shown in fig2 cannot be used in the filling device 20 according to fig4 , since the spoked wheel 25 lies with the flange 28 on the filling connection piece 22 and the rods 26 cannot be inserted into the slots 11 of the connection piece top side 10 . a filling of the anesthetic dispenser 21 is not possible with the bottle adapter 1 , even though it would be compatible with regard to its anesthetic - specific coding . while specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention , it will be understood that the invention may be embodied otherwise without departing from such principles .