The pumping industry was revolutionized with the creation of the vertical pump motor in the early 1920’s. This allowed for electric motors to be attached to the top of a pump, and the impacts were impressive. The installation process was simplified, and because it required fewer parts, was then less expensive. The efficiency of the pump motors increased by 30%, and because vertical pump motors are purpose specific, they are more durable and reliable than their horizontal counterparts. Vertical pump motors are generally classified by their shaft type, either hollow or solid.