Ek fc terminal quad semi parallel is a high quality interconnection for connecting four 4 ek full cover water blocks in a single sturdy unit connecting multiple graphics cards fc water blocks with awkward fittings and tubing is a thing of a past the terminal is made of high quality pom acetal there is no need to purchase additional links since the terminal is mounted directly to the water block serial and parallel water flow is graphically explained in the installation manual for use wit