hydraulic pump
hydraulic ram

The gate is raised or lowered using a hydraulic ram.

Arms with the strength of a hydraulic ram grappled at him.

Three hydraulic rams work together, driven entirely by water pressure.

Motive power for the move was a series of hydraulic rams.

Scenery was raised and lowered by hydraulic rams under the stage.

The hydraulic ram is also sometimes called a gravity pump.

They are also found in pumps and hydraulic rams.

Set on hydraulic rams, the door shot up and locked in place.

She said the water was pumped uphill using a hydraulic ram.

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