Koolance CNT-VDA2 Dual VID Connector, Adjustable 1 Slot Spacing Adjustable direct connection fitting for supported Koolance VID coolers in series or parallel. CNT-VDA2 is for SLI or CrossFire setups that span three card slots (one in between is bypassed). Koolance VID water blocks occupy the same slot as the video card. See this page for more details. G 1/4 BSPP threading, nickel-plated brass with compression fittings and gaskets.