The bitspower g 14 multilink adapter is used to connect a crystal link tube between 2 video cards in sli or crossfire for use where you need a specific distance or some room for clearance for your application bitspower fittings are the best quality for your watercooling builds features true hi flow hi quality brass material high durability nickel finished in matt black color design for multi link extension application via crystal link tube on both side dual o ring on both side rohs c