Many devices used in the care and treatment of swimming pools provide for a high velocity jet of water to stir dirt, leaves and other foreign matter from the pool bottom and walls and into suspension for removal by the pool circulation system, or to create a low pressure zone for suction of same from the bottom and walls. Since pumps are employed in the regular circulation of water from the pool through heating and/or filtering media and back to the pool again, it is highly desirable to use the available circulation pump for the pool treating equipment, as well as for other water circulation systems. In such event, it is necessary to have suitable valving means to direct the pump discharge selectively through either the normal circulation system or the auxilary pool treating systems. It is also necessary, because of the generally high flow capacity requirements for such auxilary systems, that the valve device provide high flow capacity in both the circulation and pool-treating modes. It is further highly desirable that the three-way valve be adapted so that any one of the three hubs may be connected to the suction or discharge line connected to a pump, with the other two being connected to circulation and cleaning system delivery, thus offering flexibility in plumping arrangements.