Adjustable valve: flow can be controlled. The plant waterer with control valve can control the dripping speed of 0-60 seconds/drop, and the continuous dripping of 1-15 days. Simply adjust the valve to meet your needs, no complicated set-up steps required. Save time and water. Easy and convenient: No tools are required to install, just drill some holes in the bottom of the bottle or cut the tail of the bottle to keep the air flowing. Multi-scene application: vegetables, potted plants, indoor plants, daily aquatic plants, garden plants, herbs, hanging baskets, table pots, hanging plants, outdoor gardens, small trees, shrubs. Warning: Compatible with all 1.1inch/2.8cm inner diameter, suitable for most beverage bottles, not suitable for mineral water and purified water bottles. (Measure the inner diameter of the bottle including the thread size before installation) If you are not satisfied with our products, please contact us immediately, we are very happy to provide you with the most satisfactory shopping experience.