上述金属嵌件由铅黄铜或不锈钢制成。
上述金属嵌件一端部的内表面为锥形的密封面。
The inner surface at one end of metal insert is cone-shaped sealing surface.
上述塑料层的一开口端内表面开设有螺纹，该塑料层上的螺纹与金属嵌件上的螺纹相连接。
The inner surface at one open end of the plastic layer has the thread, and the thread on the plastic layer is connected with the thread on the metal insert.
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