| 摘要 |
A preformed coupler for connecting plastic pipe to metal pipe comprises a convoluted tubular metal sleeve, a plastic tube extending part way into the metal sleeve, an annular gasket, and a retention means. The annular gasket, which encircles a portion of the plastic pipe, is compressed against the plastic pipe by the metal sleeve to form a fluid-tight seal. The retention means resists any effort to withdraw the tube from the sleeve. The free end of the metal sleeve can be telescoped over the end of the steel pipe to be joined, then the outer end of the plastic tube can be butt welded to the plastic pipe to be connected, and then the telescoped end of the sleeve can be welded to the metal pipe.
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