Patent ID: 7874660

Claim:
A closure for a supply container, comprising: a spout affixed to the container; a plug configured to plug the spout in a partially inserted position at which the plug cooperates with the spout to provide a first degree of resistance against removal of the plug from the spout and to plug the spout in a fully inserted position at which the plug cooperates with the spout to provide a second degree of resistance against removal of the plug from the spout greater than the first degree of resistance; an opening in the plug through which material in the container may flow when the plug is inserted into the spout; and a breachable seal sealing the opening; wherein the plug includes a leading end and a trailing end relative to an insertion direction of the plug into the spout, and the plug further comprises: a first keying feature on the trailing end of the plug corresponding to a first keying feature in a receptacle for receiving the trailing end of the plug, the first keying feature configured to correctly align the plug with the receptacle; and a second keying feature on the trailing end of the plug corresponding to a second keying feature in the receptacle, the second keying feature configured to prevent the plug from being received in an incompatible receptacle.