The Item IO is a block from the XyCraft mod. This block is used in the construction of the multiblock tank from XyCraft and is used to enable input/output. It must be placed as one of the side blocks. It has 3 modes: Orange, Blue, and White. Orange mode will allow the player to access the output side (right-hand side). Blue mode will allow the player to access the input side (left-hand side). White mode will allow the player to access both input and output. Modes can be changed by shift right-clicking the block with an empty hand.