Abstract: A stackable combination selector and shut off valve includes a three-way valve body which supports a two hole ball selectively rotatable for directing fluid flow through either of first and second opposite outlet ports or a central off position wherein flow is blocked to both outlet ports. The valve body preferably includes an internal manifold so that the valve may be stacked with other valves without requiring connection to an independent manifold. The motor control circuitry includes a single pole single throw on-off switch which operates in conjunction with a double pole double throw polarity reversing switch to enable the motor to work in a selected one of two quadrants.