Wilden Pro-Flo® SHIFT Series pumps are the leading air operated diaphragm pumps in their class. The innovative yet simple Pro-Flo SHIFT design features an air operated spool that automatically optimizes air consumption and eliminates overfilling, which can overload the air chamber, without compromising flow rate. This results in reduced air consumption and operating costs while maintaining maximum operating efficiency and volumetric consistency. Pro-Flo SHIFT pumps fit precisely into existing fluid transfer systems from the mounting base to the suction and discharge connections.