This a slightly used (4 15g batches) Chillus Convolutus Counterflow Wort Chiller as sold by MoreBeer
Description from MoreBeer:
Uses the same amount of water as our original Chillus Maximus counterflow but chills in half the time. 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 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 hose connections.
10 1/4" height by 11" overall diameter (coils themselves are about 6" in diameter)
I don't use it anymore because I started experimenting with the no-chill method and never looked back.
Asking $115 shipping is on the buyer.
I'm in Dallas, TX.