Easy to operate crank handle rotary pumps are used as a siphon Simply prime pump by turning crank handle several times: liquid automatically siphons to lower level Rotary hand pumps fit 15 30 and 55 gallon drums Cast iron rotary pump is ideal for heavy oil machine oil and non-corrosive liquids Barrel pump dispenses one gallon per 14 revolutions Made with a cast iron body with steel inlet and outlet tubing 2 bung adapter is perfect for drum openings