PURPOSE: To prevent the erroneous use of liquid by removing the selected part of either of a dispensing body and a closure body or both thereof and establishing a relation of a key and a lock at the time of connecting the dispensing body to the closure body fixed to a fluid container.

CONSTITUTION: This device consists of the closure body B which is fixed into the discharge hole on the fluid container and the dispensing body A which is connected to the closure body B in such a manner that fluid can flow from the container or toward the container through the closure body B and the dispensing body A forming a hermetic joint. The selected parts of the closure device portion of either of the dispensing body A or the closure body B or both thereof are removed, by which the hermetic connection of the closure body B and the dispensing body A is enabled in such a manner that the fluid may be passed through the closure body B and the dispensing body A to the container or from the container only when the dispensing body A and the closure body B are specifically made connectable like the key and the lock in the similar fashion. For example, a peg 78 of the closure body B is made fittable to a specific notch 48 of the disk 8 of the dispensing body A to allow the discharge of the fluid only in the specific state.