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Apparatus for introducing a liquid into a sealed external container or a sealed external system, the apparatus having a bellows which is sealed a first end, which is sealed at a second end solely by a valve, and which contains the liquid; wherein the valve is one which is positioned remote from the

Apparatus for introducing a liquid into a sealed external container or a sealed external system, the apparatus having a bellows which is sealed a first end, which is sealed at a second end solely by a valve, and which contains the liquid; wherein the valve is one which is positioned remote from the first end of the bellows, which retains the liquid in the bellows, and which permits liquid flow only in a direction from the apparatus to the sealed external container or the sealed external system; and wherein the apparatus further has a connector which in use forms a sealed connection between the apparatus and a sealing valve on the sealed external container or the sealed external system.

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1. Apparatus for introducing a liquid into a sealed external container or a sealed external system, wherein the apparatus comprises a bellows which is sealed at a first end, which is sealed at a second end solely by a valve, and which contains the liquid; wherein the valve is one which is positioned

1. Apparatus for introducing a liquid into a sealed external container or a sealed external system, wherein the apparatus comprises a bellows which is sealed at a first end, which is sealed at a second end solely by a valve, and which contains the liquid; wherein the valve is one which is positioned remote from the first end of the bellows, which retains the liquid in the bellows, and which permits liquid flow only in a direction from the apparatus to the sealed external container or the sealed external system; wherein said apparatus further comprises a connector which in use forms a sealed connection between the apparatus and a sealing valve on the sealed external container or the sealed external system; wherein the bellows contains the liquid prior to connection to the sealed external container or the sealed external system; and wherein the sealed external container or the sealed external system is constructed to be operable independently of the bellows. 2. Apparatus according to claim 1 in which the bellows is made of a metal or a plastics material. 3. Apparatus according to claim 1 in which the bellows has side walls which in longitudinal section have a wave form which has curved peaks and troughs, or pointed peaks and troughs. 4. Apparatus according to claim 1 in which the valve is operated by movement of the bellows. 5. Apparatus according to claim 1 in which the valve is a stem valve which is partially positioned in the bellows. 6. Apparatus according to claim 1 in which the valve is positioned remote from the bellows. 7. Apparatus according to claim 1 in which the valve is a spring biased valve which is biased by a spring. 8. Apparatus according to claim 1 in which the valve is separate from the bellows and is operated independently of the bellows. 9. Apparatus according to claim 1 in which the connector comprises a conduit having a first end which is connected to a remainder of the apparatus, and a second end which is provided with a device for connecting to the sealed external container or the sealed external system. 10. Apparatus according to claim 9 in which the device at the second end of the conduit is a screw connector. 11. Apparatus according to claim 9 in which the first end of the conduit is connected to the remainder of the apparatus by a screw connector. 12. Apparatus according to claim 1 in which the bellows includes an aperture through which the liquid flows. 13. Apparatus according to claim 1 and including a filler for filling a part of the bellows from which the liquid cannot be obtained during use of the apparatus. 14. Apparatus according to claim 13 in which the filler is a formation which extends inwardly of the bellows and into the part of the bellows from which the liquid cannot be obtained during use of the apparatus. 15. Apparatus according to claim 14 in which the formation is a hollow formation. 16. Apparatus according to claim 14 in which the filler is an insert in an inside of the bellows. 17. Apparatus according to claim 16 in which the insert is a plug which is secured in position to the inside of the bellows, or in which the insert is a one-piece insert. 18. Apparatus according to claim 12 in which: there is a one-piece insert;the one-piece insert is a non-compressible one-piece insert, the aperture in the bellows is large enough to receive the one-piece insert, and the aperture is reduced in size by a reducer device having a smaller aperture than the aperture in the bellows;or the one-piece insert is a compressible insert which is able to be compressed to pass through the aperture in the bellows and which then expands to stay inside the bellows. 19. Apparatus according to claim 16 in which the inset is a multi-piece insert formed of separate pieces. 20. Apparatus according to claim 19 and including a retainer for retaining the separate pieces of the multi-piece insert in the bellows. 21. Apparatus according to claim 1 in which the valve is positioned on the second end of the bellows.