Patent ID: 7320336

Claim:
A combination of an outlet from a vessel and a plug which is insertable into the outlet to close the vessel thereby allowing it to hold liquid, the plug having: a conduit for locating in the outlet; sealing means for sealing the conduit in the outlet such that liquid cannot pass through the outlet without also passing through the conduit; and a valve located in the conduit the valve comprising a valve member biased against a base, wherein the outlet contains a lever operably connectable to the plug, the lever being arranged to move the valve member and base between a first position in which liquid is permitted to bypass the valve and flow through the outlet and a second position in which the valve is arranged to maintain a first configuration in which the valve member is urged into sealing contact with the conduit to prevent liquid from passing therethrough unless pressure on the valve member reaches a threshold value, whereupon the valve member is arranged to move relative to the base to adopt a second configuration in which the conduit is open to allow liquid to flow therethrough.