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