I am finishing installing a gas water heater and am working on a 3/4"
copper escape line from t/p valve. I am trying to connect to anexisting
line going through an interior wall and only have 1 1/2" exposed on this
side of wall and it is just no t round enough to allow a copper
coupling! Is there a solution to this, a way to regain the roundness
needed to sweat a coupling, or use a compression fitting of some kind?
You may be able to reform the pipe end by "swedging" it.
Find a ratchet socket the size of the pipe ID and drive it in (partway).
If it's too mangled for that to work, make a hacksaw cut (lengthwise)
in the pipe end. Now you'll be able to force the coupling on and
solder it. Clean and flux the pipe end thoroughly.
In this application, a perfect connection is not needed and even
small leaks could be tolerated.
I had a similar situation recently. I had to connect to a 3/4-inch copper
pipe that was out of round due to it being along a curved part of the line.
Instead of being round, the pipe was oval. I just took a chance and
squeezed the oval pipe with channel-lock pliers to get it more round. Then
I forced the fitting onto the pipe and soldered it. Much to my surprise, it
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