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-   -   Compression vs. Solder (https://www.askmehelpdesk.com/showthread.php?t=48813)

  • Dec 15, 2006, 05:43 PM
    itrn007
    Compression vs. solder
    Hi all. I have seen bits and pieces to the answer to my question in other posts, but not sure I have the complete answer, so I will ask it directly...

    Transitioning from copper to (C)PVC, are compression junctions adequate and/or recommended, or is it advisable to use soldered connections?

    Just to clarify (and probably state the obvious) I am talking about the copper end of the junction. I know that the "plastic" end gets glued.

    Thanks all in advance,
    G-
  • Dec 15, 2006, 06:30 PM
    PaulC
    Dependson the application, if it's DWV then just glue a male adapter on to the pvc side and use a female adaptor in copper and tighten them up.
  • Dec 15, 2006, 06:53 PM
    labman
    If you are talking about adding a threaded adapter to copper, I would solder I it. I installed a water heat and water softener last summer needing to have to run some new pipe for both. I mostly used CPVC compression unions. They are cheap and easy to work with. They are not 100 % safe from the pipe pulling out. I back them up by wiring the 2 pipes together. I also used a Shark's Tooth tee in one critical spot. $9 for a 3/4'' tee, but the most quick and easiest reliable connection.
  • Dec 16, 2006, 07:57 AM
    speedball1
    While solder is the most reliable , compression fittings are the easiest to install for a DYSer. Your choice,( although I recommend solder if you have the tools and experience.) Solder a male threaded adapter on the copper pipe and prime and glue a female threaded adapter on the plastic pipe.
    Good luck, Tom
  • Dec 16, 2006, 10:51 AM
    PaulC
    Quote:

    Originally Posted by itrn007
    Hi all. I have seen bits and pieces to the answer to my question in other posts, but not sure I have the complete answer, so I will ask it directly...

    Transitioning from copper to (C)PVC, are compression junctions adequate and/or recommended, or is it advisable to use soldered connections?

    Just to clarify (and probably state the obvious) I am talking about the copper end of the junction. I know that the "plastic" end gets glued.

    Thanks all in advance,
    G-

    Again what is the application, I'm a plumber for 25 years.

    Do you know what male and female adaptors are? If it's DWV ( Drain, waste and vent) than follow the directions I gave you the last time, or explain what it is your doing.

    Solder a small piece of pipe on the adaptor before threading it together.

    Paul
  • Dec 16, 2006, 03:25 PM
    speedball1
    Welcome to the plumbing page Paul, Paul gave you excellent advice when he advised, "solder a small piece of pipe on the adaptor before threading it together." If you attempt to put heat on a copper adapter after it's threaded in to a PVC fitting the heat will melt the PVC fitting threads. As far as DWV or pressure the drill's the same. You solder a male threaded adapter on the copper pipe and prime and glue a female threaded adapter on the plastic pipe. Good luck, Tom
  • Dec 16, 2006, 08:29 PM
    labman
    Thinking about this some more. Again you buy 2 threaded adapters, you are going to have much of the price of a Shark Tooth adapter. Only problem is that a 3/4'' PVC pipe is bigger than a 3/4'' copper and won't fit. Solution? A PVC/CPVC adapter and a short length of CPVC. I used a bunch of them on my projects last summer. Found them at Lowe's.

    As I said, the Shark Tooth couplers are the easiest way to join 2 pieces of pipe, just push the plain ends of each pipe into it. It can also be easily removed.

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