Shower Valve Rough, use union or not

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by lmei007, Nov 6, 2013.

  1. lmei007

    lmei007 Member

    Messages:
    178
    Location:
    Maryland
    I just found the shower rough in I have is thread type. I would like to be solder type.

    I am a little worry about the leaking from the threaded joint after everything is there. One way to relieve this is use it with union.

    Do you think it is good idea to add an union there?

    thanks,
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,156
    Location:
    Bothell, Washington
    You can either solder in the male adapter to the body,
    or solder a male adapter onto pipe first, dope and thread in.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,882
    Location:
    Cave Creek, Arizona
    Using a union just gives you three more places it could leak.
  4. dj2

    dj2 Member

    Messages:
    425
    Location:
    California
    Plumbers have been installing threaded and sweat for years - done correctly they both have the same durability. You don't need unions.

    Just remember to remove the cartridge if you sweat.
  5. lmei007

    lmei007 Member

    Messages:
    178
    Location:
    Maryland
    a special adapter? I tried the 1/2" pipe. It cannot being plug into the body.
  6. Gary Swart

    Gary Swart In the Trades

    Messages:
    7,362
    Location:
    Yakima WA
    One way to do this is to solder a piece of pipe to a 1'2" male adapter. Then screw the adapter into the valve body. Then solder the rest of the fittings and pipe. This avoids getting the valve body too hot. This adapter is not really a "special" adapter, accepts a 1/2" pipe into one end and has 1/2" thread on the other. Very common, just ask for a 1/2" male adapter.
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