Our diaphragm pumps have totally six specifications. The sizes for import/export are 1/4", 1/2", 3/4", 1", 1.5", 2", 3" and 4". The components which contact with the fluids are usually made of aluminum alloy, nodular cast iron, polypropylene, stainless steel. Depend on the varied applications, and the materials of diaphragm can be styrene rubber, neoprene, polythene, polyether rubber, fluorine rubber, Teflon and PVDF, so that it can meet the requirements of different fluid mediums.