A multi-dimensional printer profile look-up table for color correction is generated. Such channel outputs a new three primitive color signal. The stopper member has an extensible resilient spring arm and an engaging hole defined in the stopper member for receiving and engaging the connector of the solenoid-operated valve when the stopper member is displaced. This pol gene can be on the first or second vectors or on a third vector. In an embodiment, a visible indicator such as Good is visible on a pressure gauge until the fluid pressure indicates Replace on the pressure gauge or until the piston pushes up a Replace indicator to the need to replace anode rod, to prevent corrosion and failure of the tank, while the anode is still providing corrosion protection of the tank.