Looking for an efficient and convenient way to water your plants? Look no further than the Automatic Watering Device! This innovative product makes it easy to evenly water your plants, without any tedious installation. Simply drill some holes at the bottom of a bottle or container, and insert the watering device. The Control valve allows you to adjust the flow rate, so you can customize the amount of water your plants receive. The Slow release feature ensures that your plants stay hydrated for up to 15 days. Whether you're a busy professional or a passionate gardener, the Automatic Watering Device is the perfect solution for you! ONLY use 16 oz soda bottles. Tops of water bottles are not the correct size! You are welcome, Susan, coowner and product tester.