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 blockedFor plants: by using the self watering spikes you avoid under or over watering, keeping the plants healthy, you could control the flow according to your vacation and calculate the time of each drip, but you may need to take some patience to adjust the drip that you needAttention please: our spikes are suitable for the bottles of 1.1 inch inner diameter, and they are compatible with Dr.pepper, Pepsi, coca cola, Lipton, Deet Coke and so on (Spring water bottles do not fit), and please cut the ring of bottle lid to prevent leaking, to avoid the valve sticking in the soil and loosing sight of the drip rate you can turn the valve to point UP without any problemsUpgrade design: the plant water design with fixed support structure, can prevent self-watering device dumping during using it; The upgrade regulating switch design, seamless connect the tube, effective prevent leakingPlant waterer self watering system: plant watering stakes made of ABS plastic material, durable and sturdy means that each water spike has a working life of more than a year, and our water spikes are more durable than other water spikes