Operates only when liquid flow is required, pump and motor stop instantly when discharge is closed. Can run indefinitely without damaging the pump. Santoprene diaphragm design and viton valves eliminates troublesome shaft seal and ball bearing drive assures longer pump life. Excellent self-priming capability. Features increased brushed motor windings to dissipate heat plus an internal fan which cools the pump up to 50% during operation. 60 PSI maximum pressure, 130 degree Fahrenheit maximum temperature of pumped liquid.