the drawing shows an insulated container 1 , in which liquid helium is contained . the siphon according to the invention , which permits the drawing - off of liquid helium 2 , consists of a first part 3 and a second part 4 . the first part 3 is fastened to the bottom 5 of the container 1 and to the bottom end of the neck tube 6 . through this arrangement the first part 3 of the draw - off siphon is guided into the end region of the neck tube . the top end of the first part 3 then lies outside the liquid helium 2 . at its top end the first part 3 is designed as a connection part 7 , which advantageously has means facilitating insertion , in the form of an enlarged conical insertion opening 8 for easier coupling to the counterpart 9 . the counterpart 9 is arranged at the bottom end of the second part 4 . the connection part 7 and the counterpart 9 constitute a cold - sealing plug - in connection . the seal of the counterpart 9 may be conical or cylindrical . the second part 4 , which adjoins the first part 3 , leads to the outside via a displacement device 10 . the displacement device 10 , for the thermal uncoupling of the second part 4 from the first part 3 of the draw - off siphon , consists essentially of a threaded bolt 11 , which is arranged on the head of the container 1 and has a central bore 12 guiding the second part 4 , and of a cap nut 13 which is arranged on the second part 4 and is adjustable on the threaded bolt 10 . between the central bore 12 serving as guide and the top end of the second part 4 at least one radial seal 14 is arranged . it is obvious , and needs no further description , that other constructional variants of the displacement device also exist , such as for example the reverse solution in which the cap nut is arranged on the head of the container , or the provision of inclined planes instead of a screw thread connection . the displacement device 10 permits the axial displacement of the top siphon part 4 in the vertical direction into the connection part 7 and back out of the latter . the displacement is effected with the aid of the cap nut 13 , which is endlessly rotatable on the top siphon part 4 and which , as illustrated in fig1 is turned upwards in the direction of the arrow 15 on the threaded bolt 11 for the thermal uncoupling of the second part 4 of the draw - off siphon from the first part 3 . the central bore 12 provided in the threaded bolt 11 guides the second part 4 such that when the cap nut 13 is screwed onto the threaded bolt 11 , as illustrated in fig2 accurate insertion of the top siphon part 4 into the conical insertion opening 8 of the connection part 7 is ensured . if the counterpart 9 has a conical configuration and therefore forms a conical seal , the necessary sealing power can be produced by means of the cap nut 13 on the head of the container 1 . as can be seen in the drawing , this second part 4 of the draw - off siphon can also be removed from the insulated container 1 and stored at the side of the insulated container . the user is thus given the advantage that the relatively short second part 4 can be installed or detached in a simple manner by a single operator . in addition , when it is stored outside the container 1 , the second part 4 , because of its short length , is not bent out of shape . according to another exemplary embodiment , which is not further illustrated , the draw - off siphon according to the invention is designed as a telescope , which after the drawing - off operation is collapsed to a point under or above the level of liquid at the time in question , and which in order to draw off liquid is extended . through the collapsing of the draw - off siphon to a point under or above the level of the liquid helium the advantage is gained that thermal bridges are not formed when the draw - off siphon is out of operation .