Adapter

An adapter (14) comprising first and second adapter openings having first and second fastener protuberances, liquid being free to travel between the first and second adapter openings, travel between the first and second adapter openings optionally being through a passageway (50) therebetween, the second adapter opening (40) being opposed to the first adapter opening and defined by a wall (42) forming a second adapter chamber (44) having the second adapter opening, the second adapter wall having the second fastener protuberance (20) for fastening the second adapter wall (42) to a second container, which may be the same or different size as a first container, characterized in

• a) a cylindrical snap-on pipe (32) opening defining a first adapter chamber and the first adapter opening,
• the cylindrical snap-on pipe (32) having the first fastener protuberance (54) for fastening the first adapter opening to the first container (10), and
• b) the cylindrical snap-on pipe (32) having a first proximal end and an opposed, distal second end;
• c) the cylindrical snap-on pipe (32) including at least one retaining recess (60) at the second end;
• d) the cylindrical snap-on pipe defining opposing first and second walls (64, 46) of the retaining recess (60);
• e) the second end of the cylindrical snap-on pipe (32) being shaped to include a guidance recess (80) with a first guidance recess wall (72) consistent with lowering the cylindrical snap-on pipe fastener protuberance relative to a container when the container is oriented so that the adapter is on top of the container and the adapter is rotated in the opening direction, and the guidance recess includes a second guidance recess wall, which wall includes a downward gradient when the container is oriented so that the adapter is on top of the container,
• the adapter being configured such that when the adapter is atop the container in a closed position, a lug (70) on a container can be wholly or partly accommodated within the retaining recess (60), and when the adapter is rotated in an adapter-opening direction of rotation, lug (70) can exert force against recess wall (64) forcing the snap-on pipe slightly upward and then contacting rim (36) wherein rotation of the adapter in the opening direction can result in an axial upwardly movement resulting from the angles of a bottle neck and snap-on pipe fastener protuberance and then, the first guidance recess wall (72) permits the cylindrical snap-on pipe axially to be lowered toward the container, and the second guidance recess wall (82) is consistent with the cylindrical snap-on pipe being raised relative to the container so that the fastener protuberance (54) on the snap-on pipe can maintain its axial position below a fastener protuberance (73) on a bottle neck (74) until the adapter is rotated to a position wherein, due to an interruption in one or more of the bottle neck and snap-on pipe protuberances, there is no container fastener protuberance (78) above a snap-on cylinder fastener protuberance (54) to retain the cylinder fastener protuberance on the container, and the adapter can be released from the container.