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The Relay will automatically output any stacks of items placed into it. Any machine designed to place items into an adjacent chest will treat relays as chests. This makes it simple to connect a non-redpower machine, such as an Automatic Crafting Table, to your tube network. It also makes an excellent input chest for an automatic Sorting Machine .
To remove items from a non-redpower machine, make sure the larger hole is pointed towards the machine.