Set of 6 flower pot watering devices with control valve. This new and improved design lets you control the water flow. You save time by letting this handy tool apply an even moisture to your plants while you are not home. Also you can add liquid plant food (not granular) into the water plastic bottle. Simple assembly, just screw into a 2 liter, 20 oz, 16 oz and or a 12 oz soda bottle. Includes 6x 6 inch straws and 6x 3.4 inch spikes. The opening to the spike measures approximately 1.3 inches in diameter.