This 5/8" copper convoluted tubing is perfect for making heat exchangers. We use 25' in our Digital SMART mashing systems to raise the mash temperature. Perfect for immersion chillers, the inner tube in a counterflow wort chiller, or as a heat exchanger in the hot liquor tank. The tubing is twisted to make a pattern that breaks up the laminar flow inside the tubing making this a very efficient material for heat exchangers.,,These are 9" in diameter. The two ends are 5/8" non-Convoluted tubing, and are approximately 3 to 9 inches long.