union fitting

• 管接头

union fitting的用法和样例：

例句

1. Remove union connections before sweating.
   在焊接之前要拆卸管接头。
2. 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。