1. The Venturi applicator is installed in parallel with the water supply control valve at the entrance of the irrigation area of the irrigation system. When in use, the control valve is closed, creating a pressure difference before and after the control valve. The applicator flows into the water supply line; 2. Use the vacuum suction generated by the water flowing through the Venturi tube to evenly suck the solution in the opened bucket into the pipeline system for fertilization. Make your operation more convenient and simple; If the concentration is stable, no additional power is needed, which time and resources; 3. Select the corresponding fertilization device according to the crop and irrigation area. Too big or too small is not conducive to effective fertilization; If unsure, choose a smaller size and install parallel to the main line along with the spreader kit. Adjust the valve to control the water flow to achieve the purpose of fertilization. Extend the fertilization time to achieve the purpose of fertilization; 4. Install the spreader parallelly in the pipe; 5. The direction of water flow should be consistent with the direction of the on the , otherwise it not work properly. The ball valve on the monitor should be to be fine-tuned to achieve suitable operating conditions. Please that there is no air leakage at the connection part during installation, otherwise it affect the normal operation of the spreader. Colour:Black Material:Plastic Size:1/2 Inch Package Contents: 3 * spreader 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.