A "Direct Drive" pump features a hollow shaft that easily slides onto the driveshaft of a motor or engine. The pump's flange is then mounted to the face of the engine or the shaft end of the motor. Operating at a typical gasoline engine speed of around 3450 RPM, the pump's RPM matches that of the engine since it is directly connected to the engine shaft.
These machines are best suited for occasional use rather than being a daily workhorse. The advantages lie in their competitive starting prices, as well as their user-friendly nature and straightforward maintenance requirements.