1. Function: Using the principle of siphon, suck in liquid and inject it into the irrigation pipeline, evenly irrigate with water and . 2. Easy to operate: It can be paired with a kit and easily connected to the main pipeline. The inlet and outlet are equipped with external threaded joints for easy connection. 3. Adjustable: The control valve designed in the Venturi filtration straw kit can adjust and control the suction volume. 4. Occasion: Applicable for agriculture irrigation system and chemical ,etc. 5. Size: 1/2 inch; 3/4 inch; 1 inch Colour:black Material:plastic Package Contents: 3 * applicator(1 * 1/2 inch + 1 * 3/4 inch + 1 * 1 inch) 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.