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Mr. Pump is a character who appears in the book Going Postal. He is a golem who is assigned to Moist von Lipwig as an assistant and also as a guard to prevent his escape from the postal service. He proves ideal for this task, as golems never stop until their task is completed - no matter where Moist might run, Mr. Pump will chase after him 24 hours a day until he is caught - even walking across the ocean floor to get to him. Moist, who is not stupid, soon realizes this and gives up on his ideas of escape.

Like all "younger" Golems (under 3000 or so), he has no actual name; he is designated by his function. Mr Pump previously worked in a hole in the dark for two hundred and forty years pumping water becuase his creators had never told him when to stop. His description then was "Pump 19". He was discovered eventually and employed to help the postmaster. He is also a member of the Golem Trust and is trying to buy his freedom.

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Just a hint of Arnie here, as the unstoppable Terminator...