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plural penstocks
A sluice or pipe which allows the controlled flow of water from behind a dam, typically routing it to a turbine of a power plant. quotations examples
It amazes him still, this effortless journey powered by the fall of water. Water surging through tunnel and penstock.
2017, Fiona Farrell, Decline and Fall on Savage Street, page 30
The barrel of a wooden pump. examples