| 摘要 |
The connecting piece (1) contains a first component (15) in which there are a number of lengthwise passages of different cross-sectional areas, while their length is greater than their diameter. A second component (16) consists of a bush (16) enclosing the first component and forming a sealed joint with it. An opening in the bush exposes one or more of the passages. The components move, and preferably turn, one inside the other, so that all the passages can be exposed by the opening. |
