Koolance MVR-100 Water Block (Motherboard VReg) The MVR-100 is a universal water block for motherboard MOSFET-based voltage regulator circuits. Koolance offers various swappable cold plates for the MVR-100 to fit a wide variety of motherboard brands and models. Materials include copper with anti-corrosive nickel plating. G 1/4 BSPP fitting threading. [NOTE: Currently, the MVR-PLT140 is the only compatible heat transfer plate for the MVR-100.