The Shutter Module is a cover added by GregTech 5. It can be attached to all GregTech 5 machines, pipes and cables. It controls the flow of Items, Fluids and Energy going through the side it is attached on and can be set to allow only input or output. It can be controlled via redstone signals if a Machine Controller is also connected. The mode can be changed by right-clicking it with a Screwdriver.