Alphacool NexXxoS XT45 Radiator block. This radiator block features 1/4" connections and a maximum operating pressure of 1.5 bar. Constructed from Brass, Copper, and Steel, it comes in a sleek Black finish. The NexXxos series by Alphacool represents experience and quality in the water cooling market, offering a high-performance heat exchanger designed to compete with and surpass other radiators in its class. It boasts full copper construction for enhanced performance, with separated chambers that promote high coolant flow rates. The flat chambers increase mounting flexibility, and multiple fitting installation possibilities on the chambers (inlet and outlet) reduce the need for angled fittings. This design also improves flow rates and allows for installation in tight enclosures. A 1/4" screw plug facilitates easy de-aeration and hassle-free vertical installation, and can also be used for filling. Available in various fan sizes (120mm, 140mm, 180mm) and thicknesses (30mm, 45mm, 60mm), there's a perfect radiator for every need. Mounting fans and grills is straightforward with standard M3 threads. An internal protective ledge prevents screws from damaging the fins. The fin design ensures excellent performance even with slow-spinning fans, minimizing noise and expanding fan compatibility. These radiators combine experience, performance, and innovative design for all your cooling needs.