This 7 Days to Die mod adds a excavator and a rain catcher to the game.
Simply craft the excavator and rain catcher place down on the ground and wait the days out that are set in the blocks.xml and when ready the excavator will change to a gas pump and the rain catcher will change to a sink.
After you have looted these they will destroy themselves and return to their first block.
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The forum topic of the mod is here.
Credits: Stallionsden, Various