This product is mainly used for accessories of coal mining machine and internal meshing gear pump. It is widely adopted for the hydraulic station, dilute oil station, hydraulic machinery, chemical machinery and other products, especially for the speed reducer, retarder and gearbox without oil leakage. Yet the internal meshing gear pump can be used to get water, gasoline, kerosene, engine oil, hydraulic oil, glue, coating, paint, etc.