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正翻译步骤 13

步骤 13
Use a pipe vise to unscrew the first section of riser main from the coupling. Be careful not to remove the coupling from the lower section of riser main. You may need to use two pipe wrenches to hold the coupling still while you loosen the top section of riser main.
  • Use a pipe vise to unscrew the first section of riser main from the coupling.

  • Be careful not to remove the coupling from the lower section of riser main. You may need to use two pipe wrenches to hold the coupling still while you loosen the top section of riser main.

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