What is the Difference between the GC2 and GC4? Kelsey August 22, 2024 10:27 Updated The GC2 allows for 2 fermenters to be connected to the glycol chiller and the GC4 allows for 4.Download PDF at the bottom of the article, for all the GC2 and GC4 tech specs. GC2 and GC4 Specifications.pdf 200 KB Download Related articles How to use the S40 Immersion Chiller Instructions - Original GC4 Is the Conical Fermenter compatible with other hydrometers and thermometers? Video - How to Guide on Setting Up and Using the GC4 How do I dry hop in the GF30 Conical Fermenter?