Automotive fluids, fuel, and oil hand drum pumps are designed for dispensing and transferring small volumes of fluids such as diesel fuel, coolant, washer fluid, power steering fluid, transmission fluid, and engine oil. These pumps are commonly used during automotive service and fleet maintenance to drain fuel tanks and remove spent fluids from vehicles and engine-powered machinery.Hand drum pumps are manually powered devices operated by a crank, lever, or other mechanism to draw fluids out of a container. They allow pumping where there's no access to a power source and are ideal for dispensing and transferring small amounts of fluid. Sometimes called a manual or rotary drum pump, these hand-operated pumps connect to an adapter that allows the shaft of the pump to be mounted through the bung hole of a drum or other container.