Koolance CNT-VDB3 Video Bridge Connector, 3-Cards Koolance video bridge connectors link multiple video water blocks together with ease. Flow can be directed in series or parallel. CNT-VDB3 is for combining three (dual L-bracket) video blocks which are in consecutive PCI-Express slots. This product is only compatible with Koolance VID-series water blocks which have detachable fitting bases (launched in 2013 or later). NOTE: Hose barbs are recommended for 10mm (3/8in) and 13mm (1/2in) ID tubing sizes to avoid conflicting with the water block or video card.