pump box

American  

noun

1. a chamber of a pump in which a piston operates.

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Etymology

Origin of pump box

First recorded in 1690–1700

Example Sentences

They will also install an insulation tent over the new pump box to help regulate temperature.

From Scientific American

When we got her on a heel, we tried the pumps, not being able to do it before, for our careful carpenter had ne'er a pump box rigged or fit to work; so, had it not been for the kind assistance of the man of war's people, who came off as soon as they heard of our misfortune, & put our guns on board the prize, we must certainly have sunk, most of our own hands being ashore.

From Project Gutenberg