This device turns most plastic bottles into a watering reservoir - perfect for when you are away from your beloved plants. 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.\nNow you can leave your plants, safe in the knowledge they'll be automatically watered correctly. Easy to use, the kit comes in a pack of 16 with full instructions. The cap measures 28mm across, so fits all bottles with a 25mm neck diameter \u2013 make sure to measure your bottle to ensure this dimension is correct.\nPlease note, smaller, 50cl bottles tend to have wider necks that don't fit, while the larger bottles have smaller necks that do fit.\nKey benefits:\nVersatile: Turn any bottle with a 25mm neck diameter into an automatic plant waterer, perfect for while you are away\nAdjustable flow control: Features a built in tap thm