As data centers strive to deliver ever-higher computing performance while reducing energy use and environmental impact, cooling strategies are at a turning point. With rising rack densities, air cooling alone is no longer sufficient, making Direct Liquid Cooling (DLC) a critical enabler for the future. But while much attention is given to chips and servers, the piping infrastructure behind DLC is just as vital. The choice of piping material directly impacts flow performance, coolant purity, reliability, and sustainability. In this presentation, we will explore the unique requirements of DLC piping systems, the material considerations that determine system success, and the ways in which the right solutions can prevent common challenges such as corrosion, contamination, hydraulic inefficiency, installation complexity, and embodied carbon. Join us to uncover how flow infrastructure shapes not only system integrity but also the path toward more sustainable, high-performing data centers.