PP plastic, convenient and practical. Bottled drip irrigation, which is durable, sturdy, environmentally friendly, reusable, recyclable and durable. This product is suitable for bottles with a diameter of 1.1 inches Adjustable valve: The flow can be controlled.The plant watering device with control valve can control the drip speed from 0-60 seconds/drip, and the continuous drip lasts 1-9 days. Adjust the valve uniquely to meet your needs without complicated setup steps. Save time and water. Easy to Use: Bottle drip irrigation, quick installation, no need to rotate, just lay it down, plant sprinkler, deliver water directly to plant roots, suitable for the most plants.Easy flow control means your plants get the correct amount of water.How to use: Prepare a cola bottle, fill it with water, screw dripper on the bottle,Drill some more holes at the bottom of the bottle,Make sure air can get into the bottle.Suitable for bottle: Pepsi bottle , Coca-Cola bottle, 1.1 inch inner diameter bottles. (Bottle not included). Most beverage bottles.Size13.5*3CM Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference of light and display, there will be a certain color difference, depending on the physical object received Delivery Quantity: (according to the main picture)