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