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There was a hydraulic separator question earlier but I have another. I installed the system design that is in idronics #10 page 29 figure 6-14. I am most likely over sized on the separator right now but I will be adding heat to my garage and two more small rooms. The generously sized headers I put in are most likely oversized also. I have no complaint's with how the system works. The only compliant I have is I was limited on room for the installation. Here is the question, What does the hydraulic separator do, what is it's purpose?