Abstract: An improved rotary plug valve which has a housing having an axial, tapered inner wall forming a tapered inner cavity, with a plurality of radial openings in a transverse plane, at selected angles, leading into the tapered inner cavity. A rotatable tapered plug is adapted to fit inside the tapered cavity, and having "0" ring seal means to seal the outer surface of the plug to the inner wall of the housing. Selected conduits through the plug provide means to control flow of liquid entering one or more of the openings in the housing, to flow through the plug to other selected openings, dependent on the anular position of the plug. The cavity is closed by top and bottom closures. The rotor has an axial shaft, by means of which it can be rotated exteriorly of the valve, by the passage of the shaft up through the center of the top closure.