Newly Adjustable Valve - Precise valve control switch, adjust the speed of water flow more easily and effectively.We upgraded the switch,it is easier for you to change the speed of the waterer. Superb Material - Made of PP plastic and you can use it repeatedly because each irrigation drippers ensure long service life. With High strength and toughness, good heat and cold resistance, safe and durable. Recycle plastic bottles effectively. Reduce waste and protect the environment. Easy to Operate - No tools are required for installation, No Need drill or cut holes at bottom of the bottle. Just turn on the control valve and fixator, and place the fixator on the bottle, then turn the bottle upside down! No need to care about the water pressure. No leakage! Suitable for Different Bottles - The plant watering device is suitable for all most bottles. It not only can be used for 1 inch bottle, all the bottles which opening is 0.78 inch -1.1 inch can be suitable. such as Coca-Cola bottle, soda bottle, even the wine bottle. Widely Application - Whether your plants are indoor or outdoor, at home or in the office, this self watering spikes system ensure your plants hydrated. These plant watering devices are perfect for potted plants, houseplants, patio plants, hanging baskets, deck pots, hanging plants or any other plants.