Features: -The water pump has self-priming function. -Equipped with a pressure protection switch, it can automatically stop for protection when the pressure is over, until the pressure is less than the threshold, it will automatically restart. -Install in a dry and ventilated place; the pump cannot be put into water to work. -Application: pressure pump for sprayer, spray cleaning device with small flow and high pressure, water purification system with small flow, filter, chemical metering and liquid addition, transfer, distribution and filling of food liquid with small flow. -It can run dry for a short time (no more than 30 minutes) .