1. With electricity, the water pump does not rotate. Check whether the wire behind the motor falls off. 2. The water pump rotates and sprays water, but the amount of fog is small and the pressure decreases. Turn on the water pump and check if there are any debris blocking the pump chamber.Check if the motor bracket is loose and tighten the screws. Note that the inlet and outlet valves cannot be installed upside down. 3. After the pump is used for half a year or one year, the pressure and the volume is small. Turn on the water pump and tighten the motor bracket screws; Change the direction of the small mold pieces in the cavity or replace the small grinding pieces. Note:The sticker style on the product is random and cannot be specified. Colour:Black Material:Polypropylene Package Contents: 1 * Agricultural Electric Dual Core Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.