| 摘要 |
In a three piece coupling which has bushing with internal and external threads for assembly on a threaded end of a conduit by its internal threads, a sleeve adapted to fit over a second conduit to be joined by the coupling with internal threads operable to engage the external threads of the bushing to advance the sleeve on the bushing when it is rotated and a collar sized to fit within the sleeve without restricting its rotation, the collar having internal threads for assembly on a threaded end of the second conduit to be connected with the coupling and retained in the sleeve so that the collar is advanced with the sleeve, the improvement including a first seal operable to effect a water tight seal between the bushing and the sleeve and a second seal operable to effect a second water tight seal between the sleeve and a conduit connected to the collar by mechanical compression whereby the coupling joins the conduit components in a water tight joint without rotating the components and without losing conductivity through the coupling.
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