The Macnaught 50:1 Air-Operated Heavy Duty Grease Pumps are suitable for high-volume grease applications requiring continuous high-pressure grease output. These portable grease dispensing systems are engineered for 35-lb, 120-lb and 400-lb containers. They are equipped with a low air consumption motor that doesn't need to be lubricated due to the use of modern polymer materials. These pumps are designed for a wide range of heavy duty applications and come complete with a 10-year warranty.