Using the siphon principle, it is suitable to breathe various liquid fertilizers and inject them into irrigation pipes, and water and fertilizer can equally water various products. The main pipe can be easily connected to the fertilizer with the applicator kit and they are external toothed joints for easy entry and exit connection. When using, set the valve in the main water pipe to obtain a suitable pressure difference before and after. It should be connected directly to the pipeline using vacuum and atmospheric pressure produced by Venturi manure, fertilizer solution is equally absorbed from the open fertilizer barrel for fertilization to the pipeline system. 1/2 'Suitable for BSP input/output connector. Quality engineering pom plastic, good workmanship, robust and durable. Efficient and compact differential injector size: POM PLASTIC ; input/output yarn size: 1/2 inch ; flow range speed: 0.29 ~ 0.81 m3, 0.7 ~ 0.95. If you have a pleasant shopping experience, if you need help with our concerns or Venturis, the highest customer standard. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store