【 Adjustable valve 】 The flow can be controlled. The plant watering device with control valve can control the dripping speed of 0-60s/drop, and the continuous dripping time is 1-15 days. Just adjust the valve to meet your needs, without complicated setup steps. [Simple and convenient] It can be installed without any tools. Just drill a few holes at the bottom of the bottle or cut the tail of the bottle to maintain air circulation. [Multi scene application] Vegetables, potted plants, indoor plants, daily water plants, patio plants, herbs, hanging baskets, basins, hanging flowers, outdoor gardens, small trees and shrubs. [Warning] Compatible with all 1.1 inch/2.8cm inner diameters, applicable to most beverage bottles, not applicable to mineral water and purified water bottles. (Measure the inner diameter of the bottle before installation, including the thread size)