force pump

This projectile was discharged from a powerful air-gun—the walking-stick form—provided with a force-pump and key.

I said, and then she asked, "Is there a windmill or a force-pump?"

There was only the sound of the force-pump and the swallowing of the Eddy.

The fact is that the root acts as a kind of force-pump, and keeps up a constant pressure inside the tissues of the plant.