Operates on the principles of vacuum suction created by an advanced Venturi complex. This implements the latest know-how in hydraulic technology and allows the injectors to operate at small pressure differentials. A vacuum is created as the water flows through a converging passage that gradually widens. Injection is activated when there is a pressure differential between the water entering the injectors and the water, and chemical leaving to the irrigation system. This pressure differential is between 5-75% according to the required injection rate.