Universal adapter for liquid transfer

1. A universal adapter device for facilitating transfer of liquid from a neck of a liquid dispenser to a receiving container, the device comprising:

a hollow body that includes a flexible liquid inlet with an inwardly sloping flexible collar for adapting to the neck of the liquid dispenser;

a liquid outlet for connecting to an intake of the receiving container; and

a one-way valve for allowing air from the ambient atmosphere into the hollow body when a pressure within the hollow body is less than ambient pressure,

wherein when the liquid dispenser is pressurized, expanding of the flexible inlet due to a pressure build up in the universal adapter device is detectable by a user to indicate that the receiving container has been filled.

2. A device as claimed in claim 1 , comprising a barrier between the one-way valve and the liquid outlet for directing air bubbles formed by air entering through the one-way valve away from the outlet.

3. A device as claimed in claim 1 , comprising a connector for connecting the outlet to the receiving container.

4. A device as claimed in claim 1 , wherein the one-way valve comprises a flapper valve.

5. A device as claimed in claim 4 , wherein the flapper valve comprises an umbrella valve.

6. A device as claimed in claim 1 , wherein the outlet and the one-way valve are located on a rigid plate, and wherein the hollow body is in the form of a flexible sleeve that grips the rigid plate.

7. A device as claimed in claim 1 , wherein the hollow body includes a ragged outer surface.

8. A device as claimed in claim 7 , wherein the ragged outer surface includes ribs.

9. A device as claimed in claim 1 , wherein the hollow body includes an indented waist.

10. A device as claimed in claim 1 , made from materials selected from the group of materials consisting of: synthetic rubber, natural rubber, and thermoplastic elastomer.

11. A device as claimed in claim 1 , wherein the liquid inlet is circular.