GPI 114000-5 Aluminum HP-100-NUL Dual-Flo Piston Hand Pump is a premium hand pump that is reliable and versatile. For high-volume fuel transfer, use the high handle position. It generates twice the flow of any other hand pump. For heavier fluids or easier pumping, use the second stroke setting. It features a Dual-Flo piston design that pumps fluid on both the push and pull stroke, delivering the highest flow rate in the industry year after year, up to 50 gallons per 100 stroke cycles (push/pull). The two-position handle allows you to change increments from quarts to pints to dispense gasoline, diesel fuel, and kerosene with ease. It is constructed from lightweight and durable cast aluminum.