Patent ID: 8443999

Claim:
A cap adapted to be mounted to a receptive portion of a container and to be disconnected from such receptive portion of such container, said cap having a top and a bottom, and an outer perimeter, and comprising: (a) an outer wall, having a top and a bottom, and an inner surface and an outer surface, and having an outer wall outer perimeter at the outer perimeter of said cap, the outer wail outer perimeter comprising a solid continuous rim in a single plane at least one of the top or the bottom of said outer wall; (b) an inner wall having a top and a bottom, and extending directionally between the bottom of said cap and the top of said cap, said outer wall extending about said inner wall; (c) at least one connector connecting said outer wall and said inner wall to each other; (d) at least a first axial passage extending entirely through said cap, from the top of said cap to the bottom of said cap; and (e) a plurality of openings in said outer wall, and extending between the inner and outer surfaces of said outer wall, and bounded on all sides by said outer wall, the plurality of openings being located between the top of said outer wall and the bottom of said outer wall, and defining passages which can convey air between the inner and outer surfaces of said outer wall.