Patent ID: 7055710

Claim:
A container closure assembly comprising: a container neck having side walls defining an opening at one end thereof and a lip extending around the opening, wherein an inner surface of the side walls proximate to said lip is inwardly tapered; a closure for said neck, the closure having a base portion and a skirt portion; a first screw thread on the neck; a second screw thread on an inner surface of the skirt of the closure; said first and second screw threads being configured to enable a user to secure, remove and resecure the closure into a sealing position on the neck by rotation of the cap on the neck; a sealing plug extending from said base portion of the closure inside and substantially concentric with said skirt portion of the closure, wherein the sealing plug comprises a plurality of circumferential sealing ribs on an outer surface of said sealing plug for engagement with said inner surface of the container neck when the closure is secured on the container neck; at least one flexible sealing fin between the sealing plug and the closure skirt for engagement with the lip of the container when the closure is secured on the container neck; at least one circumferential sealing rib on an inner surface of said skirt of the closure for engagement with an outer surface of the container neck proximate to said lip when the closure is secured on the container neck; wherein in use a first one of said sealing ribs on the plug is located substantially the same longitudinal distance from the base portion of the closure as a first one of the at least of circumferential sealing rib on the inner surface of the skirt closure, whereby the lip of the container neck is pinched between the said first sealing ribs when the closure is in the secured position on the container neck.