The Duplicator is an admin or map maker item, and is made for servers or singleplayer adventure maps where treasure chests have to be constantly filled, or for supplying items to server members (i.e. supplying shovels to a spleef game.). It could also be used to make a factory, supplying infinite materials for an automatic crafting table. There is no crafting recipe, for it would be highly overpowered.To retrieve items from the Duplicator, place an item in the slot in its GUI, and then connect wooden pipes and an Engine. (Or a filter, a timer and pneumatic tubes) Items will constantly pump out as if it were a chest filled of that item. They can duplicate any item, even items without an EMC value. On servers they can only be used by opped players.
The duplicator can crash a game and break servers (tested in SMP) if used with a REP.