32mm Venturi Automatic Fertilizer Injection Switch Filter Water Pipe Sprinkler Garden Irrigation Accessories Specification: Color: Gray Material: Plastic < p>Optional: 32mm Features: Made of engineering plastic, strong and durable. Excellent chemical resistance to most chemicals. < p>Very efficient and compact differential pressure injection device. Drip injection and sprinkler irrigation systems for fertilizers and chemicals. The timing of irrigation with water and fertilizers is an important feature of drip irrigation. What are Venturi Fertilizer Injectors? - A Venturi is a device that creates a vacuum when liquid passes through it. The fluid that creates the vacuum is called the motive fluid. The motive fluid of irrigation injectors is the irrigation water itself. The vacuum created by the Venturi draws fertilizers or chemicals into the aquifers. How do Venturis work? -Our Venturis are water. Driven, meaning they are driven by the pressure of the irrigation network. The power to