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The new rig was winterized when I purchased it, so I have not done it yet. I think I am just going to go with antifreeze.
My old trailer had copper tubing and no hot water bypass. Antifreeze alone was not going to work. I ran about half gallon of RV antifreeze through the water pump to make sure it was protected and to get some in WH. I then blew out all the lines, hot and cold using my compressor.
I poured antifreeze into the drain traps when done.
I did that for 22 years and never had an issue, even after polar vortex winters.
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