Abstract: A multiport valve with union plumbing connections utilizing a disc diverter of diameter larger than the valve's flow port diameter permanently housed in a spherical two piece welded housing that yields a nonserviceable but easily replaced multiport valve with low resistance. With removable plugs having surfaces shaped to correspond with the interior of the valve, the valve configuration can be changed from four ports to three or two ports at any time. Two external valve coupling flanges located normal to the ports together with clamps and a drop through actuator shaft allow multiple valve operation by a common shaft. An offset indexing spline located in the disc diverter's actuator shaft hole together with an ivertable valve body design allow relative positioning of valve diverters to be either parallel or perpendicular in multiple valves/common shaft configurations.