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Well i don't know if its from the name of the guy who invented it, or if it is a "de-gassing" tank, which is another name for a de-aeraetion tank, to let the entrained air out of the system at the highest point.
I do really notice that my degas bottle really circulates coolant with my coolant filter, because the filter pulls a small bit of coolant out of the side of the pump, and the return to the system is in the degas bottle, and i know it circulates it.