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The inner tube is made from 12' of 5/8 inch convoluted (twisted) copper which continually turbulates the wort as it flows through. The outer tube is made from 7/8 inch copper. The convoluted Chiller allows you to pump wort through without having to restrict your pump to slow down flow. Use 1/2 inch line to connect to wort in and out feeds. The water connections are male and female 3/4 inch hose (GHT) connections.10 1/4 inch height by 11 inch overall diameter (coils themselves are about 6 inch in diameter).