Adjustable valveThe flow rate can be controlled. The plant watering Device with control valve can control the dripping speed of 0-60s/drip, and the sustained drip lasts for 1-15 days. Only adjust the valve to Meet your needs without complicated setup steps. Simple and Convenient Installed without any tools, just drill some holes in the bottom of the bottle or cut the tail of the bottle to keep the air flowing.Loosen the slow release control valve switch on the regulating valve according to the irrigation needs. Multi-Scene ApplicationVegetables, potted plants, houseplants, water plants day-to-day, patio plants, herbs, hanging baskets, desk pots, hanging plants, outdoor gardens, small tree, shrubs. WarningCompatible with all 1.1 inch/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) Attention: Due to manual measurement, please allow for a slight error. Please make sure you don't mind before bidding. The color may vary depending on the monitor, please understand. Attention: Hello, please pay attention to your shipping address when purchasing products. If your shipping information (such as name, street, house number, doorbell/email without name, etc.) is incorrect, the order will not be delivered correctly