| 摘要 |
A threaded cap having an axially-disposed element containing an additive adapted to be engaged upon a threaded neck of a container. After the cap is tightened, the element is distorted resulting in release of the additive which is in liquid form into the container without spilling. In the disclosed embodiment, the element is ruptured by an axially aligned plunger which is manually operable by the user. |
