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A teat unit has a flexible teat, a receiving head and a dimensionally stable base part. The teat is arranged on the receiving head. The receiving head and the base part are connected to each other by a releasable plug connection, and the receiving head has a securing element for securing the teat un

A teat unit has a flexible teat, a receiving head and a dimensionally stable base part. The teat is arranged on the receiving head. The receiving head and the base part are connected to each other by a releasable plug connection, and the receiving head has a securing element for securing the teat unit on a drinks container.

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1. A teat unit comprising: a flexible teat,a receiving head,a dimensionally stable base part, anda venting valve,wherein the teat is arranged on the receiving head,wherein the receiving head and the base part are connected to each other by a releasable connection,wherein the venting valve is arrange

1. A teat unit comprising: a flexible teat,a receiving head,a dimensionally stable base part, anda venting valve,wherein the teat is arranged on the receiving head,wherein the receiving head and the base part are connected to each other by a releasable connection,wherein the venting valve is arranged in the base part, andwherein the teat comprises a circumferential edge, wherein the circumferential edge is clamped between the receiving head and the base part when fitted in the correct position of use on a drinks container. 2. The teat unit of claim 1 wherein the venting valve is held by the base part. 3. The teat unit of claim 1 wherein the base part comprises an inner truncated cone. 4. The teat unit of claim 3 wherein said inner truncated cone has rectilinear flanks. 5. The teat unit of claim 3 wherein said inner truncated cone has curved flanks. 6. The teat unit of claim 3 wherein the venting valve is arranged in said inner truncated cone. 7. The teat unit of claim 6 wherein the venting valve is held in said inner truncated cone. 8. The teat unit of claim 3 wherein the base part comprises an annular body and wherein the inner truncated cone extends to the receiving head. 9. The teat unit of claim 8 wherein the base part comprises a circumferential sealing edge and wherein the inner truncated cone is arranged within the circumferential sealing edge. 10. The teat unit of claim 8 wherein a through-opening is arranged in an uppermost area of the truncated cone. 11. The teat unit of claim 1 wherein the receiving head comprises an outer truncated cone. 12. The teat unit of claim 11 wherein the outer truncated cone comprises a flattened tip and wherein a through-opening is arranged in the flattened tip. 13. The teat unit of claim 11, wherein the base part comprises an inner truncated cone, and wherein the outer truncated cone surrounds the inner truncated cone. 14. The teat unit of claim 13 wherein a gap is formed between the inner truncated cone and the outer truncated cone, wherein the gap forms a vent chamber and wherein the venting valve communicates with the vent chamber. 15. The teat unit of claim 14 wherein the outer truncated cone has a first inclination and the inner truncated cone has a second inclination, wherein the first inclination and the second inclination are different from each other. 16. The teat unit of claim 1 wherein the receiving head comprises an underside directed to the base part and wherein said underside comprises a sealing surface. 17. The teat unit of claim 1 wherein the releasable connection is a plug connection allowing for the receiving head to be plugged into the base part. 18. The teat unit of claim 17 wherein the receiving head has a securing element for securing the teat unit on a drinks container. 19. The teat unit of claim 18 wherein the receiving head has at least one protruding plug element for the plug connection to the base part, and wherein the securing element is arranged on the at least one plug element. 20. The teat unit of claim 1, wherein the receiving head is designed in one piece and is dimensionally stable. 21. The teat unit of claim 1 wherein the teat is pushed over the receiving head, wherein the circumferential edge engages around a circumferential edge of the receiving head and bears on a circumferential sealing surface of the receiving head, wherein the base part has a circumferential sealing surface interacting with the circumferential sealing surface of the receiving head, and wherein the teat is clamped between the base part circumferential sealing surface and the receiving head circumferential sealing surface when fitted in the correct position of use on a drinks container. 22. The teat unit of claim 1 wherein the venting valve is a duck bill valve. 23. The teat unit of claim 1 wherein the receiving head and the base part have through openings for forming a channel between a suction opening in a mouthpiece of the flexible teat and a container, the channel conducting a liquid from the container to the suction opening. 24. The teat unit of claim 23 wherein the venting valve is arranged in one of the through openings. 25. The teat unit of claim 24 wherein the venting valve is arranged in the through opening of the base part and is fixed to the base part.