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1. (Science: engineering) A vertical pipe, open at the top, between a hydrant and a reservoir, to equalize the flow of water; also, a large vertical pipe, near a pumping engine, into which water is forced up, so as to give it sufficient head to rise to the required level at a distance.

2. A supply pipe of sufficient elevation to enable the water to flow into the boiler, notwithstanding the pressure of the steam.