In fertigation, a Venturi plays a crucial role in accurately injecting fertilizers or other nutrients into irrigation water. A 3/4" Venturi with a suction port is a specialized component used in fluid dynamics and engineering applications. The Venturi itself is a tube with a narrowing middle section, designed to accelerate fluid flow in a controlled manner. In this case, the Venturi has a diameter of 3/4 inches, indicating its size.