Adjustable Switch, It can be adjusted to provide appropriate water according to different plant needs, can control the velocity of flow, so you don't have to worry about the water being too fast or the hole being blocked.
Easy to use, No dangerous trepanning and trouble preparing work, Just put in the right bottle.(Dr.Pepper, Pepsi,coca-cola, Lipton, Deet Coke, Aquafina, or another bottle that has a 1.1inch inner diameter capsule.)
The new upgrade gives Plant Watering stakes a better airtightness, which makes the water in the bottle not flooded your flower box and killed everything.

How To Use:
1) Insert the control valve into the plant waterer
2) Take a suitable plastic bottle and fill it with water
3) Install the plant waterer to the filled bottle
4) Flip over the bottle and insert the watering spikes into the soil