Precise water volume, providing different amounts of water for different plants and flowers, The bottle mouth is 1.1 inches, suitable for most beverage bottles, not for mineral water and other bottles.'pure water. It is the perfect choice for watering any houseplant.It's perfect for those who travel and want to make sure their plants are properly watered.The large plant box will require two or more plant fountains. Self-watering drippers are a simple and effective way to water plants during the holidays. Automatically maintains potted plant soil at optimal moisture levels. The flow rate can be controlled.The plant watering device with control valve can control the dripping speed from 0-60s/1 drop, and the sustained release drip lasts for 1-15 days. Simple and practical, no need for cumbersome installation, just drill a few holes in the bottom of the bottle or cut the tail of the bottle. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store