Who makes pumps (CDU internals) for AI data centers

The pump is what makes the technology-side loop a loop. Inside the CDU it circulates coolant out through the manifolds and cold plates and back through the heat exchanger, and its head and flow rating set how many racks a single unit can serve. Everything else in the CDU can be sized generously; the pump is the part with moving components and the shortest maintenance interval. That is why redundancy is designed in rather than added. Standard practice is a redundant configuration where a second pump can carry the loop alone, with the ability to swap the failed one without taking the loop down, because the compute it serves cannot ride out a coolant interruption for long. Variable-speed drive is normal too, since matching flow to load saves parasitic power that would otherwise be charged against the facility's efficiency. AI has raised what is being asked of these pumps mainly through scale — larger CDUs serving denser rows — and through fluid choice, since glycol mixtures and dielectric fluids behave differently from water. What to look for is whether a supplier is selling into CDU builders as a component or selling complete skids, and how the redundancy is arranged, since a configuration that requires taking the loop offline to replace a pump is a different operational proposition from one that does not.