Patent ID: 8342344

Claim:
A cap adapted for selective interconnection to a neck of a plastic container, comprising: a main panel with a threaded circumferential sidewall extending therefrom; at least one fin extending from said main panel and operably spaced from said sidewall, said at least one fin further comprising at least one opening to allow the ingress and egress of ambient air during the closure of said cap; a diaphragm having a head with an inner skirt extending therefrom that is interconnected, via a convolution, to an outer skirt, said outer skirt interconnected to a seal that is positioned between said sidewall and said at least one fin and which is adapted to engage an upper edge of the neck of the container; wherein as said cap is rotated onto said neck of said container air is trapped below said diaphragm to create a positive pressure in a headspace of said container; and wherein said head of said diaphragm moves from a first position substantially adjacent to said main panel to a second extended position away from said main panel when a fluid within the container is cooled a predetermined amount.