About Product:Doper is a manual tool for adding grease to mechanical equipment. It can be optional iron gun barrel (iron gun head) or hose (flat gun head) oil nozzle. It is convenient for the refueling position to be in a spacious place with iron gun barrel (iron gun head), and it is hidden for the refueling position. If you beat around the corner, you must use a hose (flat gun head) to refuel. This product has many advantages of simple operation, convenient carrying and wide application range, and is a necessary tool for the vast number of agricultural machinery operators and maintenance centers.