The Configurable Vertical Integration CVI invention pertains to methods and apparatus for the enhancement of yields of 3D or stacked integrated circuits and herein referred to as a CVI Integrated Circuit CVI IC. The fixing unit is adapted to be secured to the deck, and is formed with a water supply hole corresponding in position to the water inlet hole in the valve body and adapted for connection to the water inlet pipe. In another example this variation is afforded by leaving the conductive layers electrically connected or breaking the connection.