Relay

The Relay will automatically output any stacks of items placed into it. Any BuildCraft machine designed to place items into an adjacent chest will treat relays as chests (Industrialcraft machines like the Pump and Miner may not recognize it). This makes it simple to connect a non-redpower machine 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.