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Thread: copper pipe questions

  1. #1

    Default copper pipe questions

    hi im new here and i have a question. im gonna be working with copper and im wondering what is better to use? the copper epoxy or soldering the copper? the copper will hold about 300-400 psi

    didnt know where else to post this question so i hope this is the ok section for it.

  2. #2
    Jack of all trades frenchie's Avatar
    Join Date
    Dec 2006
    Brooklyn, NY and Fire Island, NY


    Quote Originally Posted by trae08
    the copper will hold about 300-400 psi
    Lord, I hope that's a typo.
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  3. #3


    lol umm no its not i dunno about 300-400 but it will go up to 200.

  4. #4
    Homeowner geniescience's Avatar
    Join Date
    Nov 2005
    humid summers hot, humid winters cold


    explain more, tell more, give more context. Something will be clearer after that.

  5. #5
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    First, forget about the epoxy on copper. Solder it. But what in the world are you working on that will have 200 psi? If this is some kind of boiler, you should not be doing this yourself. If it's a home water system, there seems to me that there is no way you can have that much pressure. It would blow everything in the house about, especially the water heater and toilets.

  6. #6


    o ok well here it is. im building a potato gun. an thx for the info.

  7. #7
    DIY Senior Member CHH's Avatar
    Join Date
    May 2007
    Denver, CO


    Well it is Sept and school has started again...

    The traditional potato gun is made from PVC. Much cheaper than copper and easier to work with.

    If you have to use copper then just solder it or use epoxy it really won't matter. If the darn thing blows up in your face then I will deny ever making this post.

  8. #8


    yea i know there made from pvc and i have made a few pvc guns myself. go here an check out some of them www.spudfiles.com but im using copper cause its smaller then pvc and its going to fit in the stock on the new gun..

    and if it blows up im not the kinda person to come after you for saying use epoxy or solder it

  9. #9
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default epoxy

    I would not trust epoxy at 100 psi, much less 200 psi. Solder the copper with 95/5 solder and make good joints. And use at least type "L" copper. By the time you get done, you might have been able to purchase an Uzi cheaper.


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