Specially designed for evaporative air coolers, this pump features acid-proof, alkali-resistant, ageing resistant polymer case, stainless steel axle, electrophoresis treated stator, epoxy resin sealed coil, thermo cutout device and photoelectric jam sensor. All these features, along with its unique construction, ensures an excellent performance in the high humidity environment of evaporative air coolers, and provide a total protection of the machine from overheat and accidental clogging of the machine.