Applicable DiameterTotal 12pcs Auto Watering Device. International standard beverage bottle size that fits most bottles. most bottles, such as Pepsi, Coca-Cola, or other bottles with a capsule with an interior diameter of 0.8 to 100 mm. 1.9 inches. Suitable for mostDrip Irrigation Drop Bottle is made of ABS plastic, having good resistance to cold and heat. heat, is durable. It can be used continuously even in harsh conditions and has a long service life. Adjustable Flow SpeedThe Plants Irrigation System with regulating valve can control the flow rate. dripping speed from 0 to 100% 60 seconds/drop drip, and the drip extended release lasts from 1 to 10 minutes 15 days, can prevent excessive watering. Ideal for short business trips or vacations. Easy to use InstallWithout any tedious installation, all you have to do is install. do is to drill a hole in the bottom of the bottle to keep the air circulating and tighten the drip irrigation devices together. drop, then insert the points into the ground. Wide Range of UsesThis Automatic Plant Waterer Can provide water directly to the roots of plants, is suitable for plants. for indoor and outdoor gardens, hanging plants, shrubs, potted plants, herbs, etc., most plants.