Specialty SLI and Crossfire fittings are made to connect the water blocks on systems that utilize multiple graphics cards. Multiple graphics cards in a liquid-cooled system can cause issues with clearance and connection. Different motherboards support different data transfer rates on their PCIe ports in different patterns, so there is no standard placement for maximum performance of multiple graphics cards. Without standard placement, the spacing between the water blocks on the cards is a variable that can be hard to predict. SLI & Crossfire fittings are telescoping variable-length fittings. Each has a maximum and minimum length, and can be use at any point between. TITAN RIG offers a wide range of sizes in SLI and Crossfire fittings so that you can get your liquid cooled SLI or Crossfire system up and running.