Diaphragm pump combines the advantages of self-priming pump and chemical pump. Automatically on or off: When the water outlet is , it will automatically cut off power, the motor stops. After the water outlet is opened, it will automatically power on, the motor runs. Water pump with a pressure switch will be automatically cut off when the pressure of water outlet is too high. Rubber bracket can absorb vibration from the pump when working. Installed in a dry, well-ventilated location and can't work in water.