Patent ID: 6997359

Claim:
A bottle closure comprising a generally cylindrical inner member adapted to be threadedly engaged on the outside of the neck of a bottle and having a central passage communicating with the neck of the bottle and an outer member rotatably mounted on and around said inner member; said inner member including a valve seat defining a fluid passage between the bottle and the outer member and being located within the neck of the bottle and said outer member including a valve closure element adapted to close said fluid passage in a first angular position of the outer member on the inner member and form a seal with the valve seat and to open said fluid passage in a second angular position of the outer member relative to said inner member thereby to allow fluid in the bottle to flow through the closure, said inner member further including means for engaging the top portion of the neck of a bottle to form a seal therebetween and said inner member and said outer member further including cooperating means for forming a seal between the outer surface of the inner member and an inner surface of the outer member.