Features: Suitable for graphics gpu heat; motherboard northbridge southbridge, graphics; semiconductor cooling piece, low-end cpu can also be used in conjunction. The diameter of internal flow channel is 6mm round hole channel. Integration of parts soldering, the leakage rate of parts is less than 5 x 10-6mbar.l/s. The widest part of the copper water cooling block nozzle is 8.5mm, and a diameter of 7mm water pipe is fitted with. Products connector is the side exports, as shown. please observe own equipment before buying. To avoid conflict with the pipes. Made of high quality pure copper, surface polishing, improve the heat transfer efficiency. Specifications: Material: Pure Copper Color: Copper Type: Volume Heat Exchanger Heat Transfer Mode: Recuperative Heat Exchanger Water Flow Channel: Double U Channel Size: 40 * 40 * 10mm/1.57 * 1.57 * 0.39inch Water Nozzle Outer Diameter: 8.5mm/0.31inch Fitting Hose: Inner Diameter of 7-8mm/0.28-0.31inch Process: Vacuum Brazing Surface Treatment: Polishing Package Weight: approx.125g Package Included: 1 x Copper Water Cooling Block