Abstract: A centrifugal pump mounted in a pipeline with its driven shaft extending vertically and a driving motor spaced above the pump on a support frame attached to the pump body and supporting the motor. The shafts of the motor and pump are vertically aligned and interconnected by a coupling that enables the end portion of one shaft to be swiveled in the coupling to adjust the alignment of the shaft axis with the axis of the other shaft and threaded screws for forcing the shaft end to an adjusted position and locking it in the adjusted position during use of the pump.