This device will make a watering reservoir from most plastic bottles perfect for when you are on holiday or off on business the irrigation kit is gravity fed it lets water flow out of the base using a tap system unscrew the easy to use tap to achieve the required flow rate of water the air is let in through a hole punched in top of the bottle not only can you leave your plants safe in the knowledge theyll be automatically watered correctly you can also add liquid plant food to boost