单词：tube union
tube union的用法和样例：
例句
- Remove union connections before sweating.在焊接之前要拆卸管接头。
- Slide the union nuts over the end connectors and screw onto the valve cartridge threads, no more than hand-tight.将管接头螺母滑入端口连接件上，并且螺纹对上阀腔的螺纹，手紧后就停止。
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