its just soft copper, you'll need to rent or buy a flare tool for the fittings. Is really easy to do, just cut to the right length, slide the fittings on, flare the end of the tubing and tighten to the next connector/valve etc. Most hardware stores sell the soft copper by the foot or by the roll.
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What he said. If you have a Home Depot or Lowes you can find the tubing and flaring tool in the plumbing section by the brass fittings. 1/2" for the main line and 3/8" branches out from there. Good luck!
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