In short, it is all the same! Basically, you should get whatever suits your build or case the best. But first, let’s talk about the reservoir pump combo. The reservoir pump combo is what we can simply describe as “fail proof” concept. The coolant will always be at the right spot for the pump to operate without any problems. There are several types of combo units that use the classic cylindrical reservoir and there are the so called “bay” pump reservoir combo units.





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