A liquid level control system including a tank; a source of liquid in communication with the tank; a pressure fluid actuated valve for controlling the flow of liquid to the tank from the source; a pressure sensor disposed in the tank to monitor the hydrostatic pressure determined by the quantity of liquid in the tank. A substantially annular sealing diaphragm made of an elastomeric material is interposed between the casing and an outer peripheral area of the skirt has a substantially annular seal made of an elastomeric material is interposed between an inner area of the skirt and the piston. A metal core is integrally formed into the belt body. The plow can be pivotally mounted to the plow portion of the hitch.