Jabsco 3890-9011 engine cooling pump, 3/4" NPT ports. 1/2" shaft. 11.3 gallons per minute. Neoprene impeller. Pedestal mount, corrosion resistant bronze. Ideal for engine cooling. The stainless steel shaft contains permanently lubricated ball bearings for a long life and heavy duty cycle. Selfpriming, with the ability to operate in either direction at variable speeds. Removable end cover for easy impeller service. Can also be used for wash down, circulation and many general purpose and dockside applications.