Model SPAN is a kind of standing stainless submersible pump which is of ISO11 found and formed by stretch suitable for the transportation of mine enterprise, construction sites, breed aquatics industry, fluid drug, drink, milk products, seawater and general caustic mediums whose physics nature is similar to water. The pump boasts the abilities of complete drainage and convenient use. The float switch can automatically control on and off with the change of the liquor level. The protector in the motor can automatically cut off the power when it overheated or overcurrented, thus guarantee the security and reliability of pump's operation even in the atrocious environment.