Here are 7 solutions to soldering a copper pipe that has water flowing thru it.
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AutoCut Pipe Cutter 1/2": https://amzn.to/2XlyqAn
AutoCut Pipe Cutter 3/4: https://amzn.to/3gPmhhz
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JetSwet Kit 1/2" to 2": https://amzn.to/2EUHbtK
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MagTorch Butane Soldering Torch: https://amzn.to/2tNMlRV
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DISCLAIMER: Got2Learn is NOT responsible for any damage done to a property of which the plumbing wasn't done by a professional, I do not recommend doing your own plumbing if you are unsure about what you are doing, always hire a LICENSED contractor when doing any type of plumbing so you can be covered by insurances if something does happen, these videos are for entertainment purposes only!