Abstract: A hand operated pump for liquids including dirty water and the like, which includes a cylindrical chamber having a foot valve at its lower end and reciprocal plunger including a rod mounted slidably in the upper end of the cylindrical chamber. The plunger includes a rod and a bellows of flexible sheet material including a generally circular central portion which is attached at its center to the end of the rod. A plurality of legs extending radially from the central portion are also attached to the rod a short distance from its end, so that the bellows can fill with liquid and expand radially to engage the interior of the chamber sealingly as the plunger moves up, and leaving the bellows free to collapse radially inwardly against the rod as the plunger moves downward within the lift chamber.