Yamada Corporation is a Japanese pump manufacturing company! Our main products are air-driven pumps, especially Air-Operated Double Diaphragm pumps (hereafter AODD pumps)!! Our AODD pumps are very user-friendly for many reasons such as; 1) simple structure or 2) portable and simple installation!! and so on! Also, Yamada's AODD pumps are with the sophisticated Japanese technology! More specifically, our AODD pumps are very durable and will help you reduce the total operation cost! We also have our original and unique technologies such as C-Shaped Spool, which can prevent the stalling, or a reset button, which can help you very easily fix the stalling!! We are also confident with our global network! In fact, we have our branch offices in the US, Netherland, China, and Thailand!! We also have many distributors around the world. Hence, the technical support is available, wherever you are!!