I need to put an adapter onto a ball valve at the end of a supply line. Do I need to shut the water off to the whole line?

  • Does it required soldering?
    – Ack
    Mar 22, 2020 at 17:40
  • Yea....attaching the adapter to go to the new bathroom. Going from copper to pex
    – Scott
    Mar 22, 2020 at 18:22
  • 2
    The pipe were you are soldering can't have water in it as it will absorb the heat and prevent a good (or any) connection. As long as your section of pipe is water free then you are good to go.
    – Ack
    Mar 22, 2020 at 18:26

2 Answers 2


The ball valve can, I assume, shut off the flow where you need to attach the adapter. In that case just close the valve, attach your adapter, and proceed.


There are other options, one is to get a “pipefreezer”, a kit that freezes a section of pipe allowing you to work on the free end.

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