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What about using PEX? I have started replacing all of my plumbing with PEX pipe which is supposed to be more resistant to freezing - not really sure if the same applies to the PEX fittings or not though. I also enjoyed seeing your use of the dovetail saw which as I remember you posted about earlier.

PEX would be okay, but would still crack if temps got too low. The fittings would be more expensive and would require special tools. That would be a good Steemit post on installing PEX.