Abstract: A device for the lifting of liquid solely by the use of solar energy is constructed of two vertically disposed pipes, one pipe extending below the surface of the liquid and the second pipe extending above the surface of the liquid. A third pipe, in the form of a transverse section, joins the top of the first pipe and the bottom of the second pipe, the transverse section being inclined to provide entrapment of liquid therein upon submergency of the first pipe. A liquid inlet is provided at the bottom of the first pipe and an air vent is provided at the top of the first pipe at the junction thereof with the transverse section. A discharge port for liquid is provided at the top of the second pipe. An air pressure differential is established between the vent and the discharge port for forcing liquid from the transverse section to the port.