Place one pipe wrench on the exposed coupling and another on the riser main above the coupling. Have a third person stabilize the upper pipe.

Be sure to place the open end of the pipe wrench towards the direction that you will turning the wrenches.

Hold the wrench on the coupling steady while the wrench on the riser main is rotated counterclockwise until the pipe comes free.

Lift the upper pipe and place the rod clamp onto the pump rod below the pump rod coupling.