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Thread: Connecting 1/2" copper to old 3/4" brass pipe

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  1. #1
    DIY Junior Member sean farrell's Avatar
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    Default Connecting 1/2" copper to old 3/4" brass pipe

    Hello,

    I am doing my bathroom over. There is still some old pipe in the walls that looks to be 3/4" threaded brass. In some places the 3/4" brass has been connected to copper. It looks like the 1/2" copper was just inserted into the cut 3/4" brass and then soldered.

    I have to do something similar and I am wondering if this is the correct approach. If yes, is there any trick to doing it? If no, what is the correct way?

    Thanks
    Sean

  2. #2
    Moderator & Master Plumber hj's Avatar
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    IF your description is correct and it is really brass pipe, then the proper connection is to thread it and use copper to IPS adapters.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member sean farrell's Avatar
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    Thanks HJ, I am pretty sure it is brass based on the fact that if I scrape away at it the metal is yellow and the age of the house (about 80 years).

    I don't have the kit to cut threads and would like to avoid buying it for two joins. I do have access to existing joins (elbow fittings). What are my chances of unscrewing the pipe at these joins and ending up with clean reusable threads that I can then attach the IPS adapters to? I have heard that old brass is brittle to work with. Can I muscle it and expect good results?

    Thanks.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Old brass is seldom "brittle" and almost always unscrews fairly easily.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member sean farrell's Avatar
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    Hello HJ, I'm not familiar with plumbing terminology. Does IPS mean Iron Pipe Standard, in which case are these the standard sized couplings I can get at the big box stores. I have purchased a 1/2" NIBCO coupling, with a 1/2 female one side and threaded on the other. The threaded side looks about the right side but just wanted to check this is what you meant before cross threading it or something.

    Sean

  6. #6
    Moderator & Master Plumber hj's Avatar
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    IPS is "iron pipe size" which is the ONLY size you will find at hardware and plumbing stores. Couplings should be threaded female pipe on BOTH sides.
    Licensed residential and commercial plumber

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