The air-operated double-diaphragm (AODD) pump is the most widely used pump in the world. He has the advantages of being explosion-proof and wear-resistant. It can also transport fluids with viscosity or particulate impurities. We currently have 3 main materials and 6 sizes of inlet & outlet to choose from. The main materials are aluminum alloy, stainless steel 316, and polypropylene. And the size of the inlet & outlet is from 3/8" to 2". DYISHENG is a professional manufacturer of air-operated double diaphragm pumps in Taiwan. We now have CE, ATEX, and ISO9001 quality certifications due to our dedication to product research and development.