1. No matter what happens to the flow rate and flow rate, the dosage of the solution is always strictly proportional to the amount of water entering the equipment. 2. This proportional pump is made of PVC material, which is , - and wear-. 3. The proportional device is installed in the water supply pipeline, and the power can be obtained without the electric driving water pressure. 4. The water pressure loss is small, and the precise proportion setting is not affected by the water flow. 5. This product is suitable for wastewater irrigation, equipment maintenance, horticultural flowers, livestock breeding, environmental protection and water treatment, industrial hygiene, vehicle cleaning, food processing, printing industry or other industries that need to be diluted. Continuous Work: 100 Days Working Water Pressure:0.2-6bar Water Flow Temperature:1-45℃(33.8℉-113℉) Pipeline Pressure:0.2-8 Pa (2.9-113.4 ) (Water pressure loss can get 0.1 Pa at low flow and 1 Pa at high flow) Water Loss:0.2 Pa-1.2 Pa Inlet and Outlet Thread:G3/4in Length:.47cm/18.5in Proportion Range:1%-5% (1:20-1:100) Flow Range:20L/H-2500L/H Inlet And Outlet Diameter:25mm/20mm Note:Due to different production batches, the product appearance , but it does not affect the use. Colour:Blue Material:Plastic Package Contents: 1 x Fertilizers Injector 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.