This is one of the best wort chillers available.  Similar to plate chillers, the wort is cooled in very quickly in a single pass.  Unlike plate chillers, this unit is easy to clean and sanitize.

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 convoluted counterflow 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.