What is the Difference between the GC2 and GC4? Kelsey September 28, 2023 15:48 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 Instructions - GC2 What is the Difference between the GC4 and GC2? How warm/cold can the GC4 Glycol Chiller get other fermenters? What are the minimum and maximum grain bills for the G30? What is the pressure range on the pressure transfer gauge?