Water cooling pumps circulate the liquid / fluid through your loop and ensure a steady and consistent flow. Because the pump is the component that keeps the fluid circulating, it's important that it never fail (or otherwise your loop will fail). Getting a top rated pump that meets your standards is a critical decision. When choosing a pump you're going to want to consider things like barb size, flow rate, and head pressure. For more complicated systems you may see multiple pumps working in tandem to ensure a steady and optimal flow.
FAQ & Section Info
Should I connect my pump to my motherboard header?
In general no! The best thing to do is to directly connect your pump to your power supply. That ensures that if the
power supply is operational, your loop is operational. A pump's job is to push fluid through the loop and you want
to ensure that if at any point there is current flowing to any part in your system the pump is running.