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To remove items from a non-redpower machine, make sure the larger hole is pointed towards the machine.
The Relay has a 3 x 3 inventory which can be accessed by right-clicking. When placed inline on a tube system items will pass through the Relay unless a valid destination becomes unavailable. This can be useful on a tube connected to a macerator where different ores that do not stack together can wait until the macerator catches up.