Air Operated Diaphragm Pump, Magnetic Pumps, Pump Parts manufacturer / supplier in China, offering Hdb2 Hdb50 Heavy Duty Ball Valve Pumps Hdb2, Db4a. Hdb2, Db4ci. Hdb2, DC4ci. for Sandpiper, Heavy-Duty Ball Pumps Fit Sandpiper Hdb2 Hdb50 Pump, Hdb2 and Hdb50 Metallic 2" (50 mm) Ball Valve Pump and so on.