Adjustable ValveThe Plant Watering Device With Control Valve Switch Can Control The Drip To Meet Your Needs. Provide Different Amounts Of Water For Different Plants And Flowers. Make Your Plants Healthier.Irrigation Drippers Suitable For All BottlesUpgraded Self-Watering Spike Fits All Normal Size Bottles In Daily Life, From 0.8 To 1, 2 Inches. Don'T Waste Time Finding The Right Bottle, Most Bottles Operate The Self-Watering System.High Quality And EconomicalMade Of High Quality Pp Plastic, Each Self-Watering Spikes Is Durable And Solid. They Can Work For More Than A Year. Efficiently Recycling Plastic Bottles And Water, They Reduce The Waste Of Resources And Protect Our Environment.Wild ApplicationThis Self-Watering Spike System Can Be Used Indoors Or Outdoors, At Home Or Office. They Are Also Suitable For Potted Plants, Indoor Plants, Patio Plants, Hanging Baskets, Patio Pots, Hanging Plants, Etc.Worry-Free Planting You Don'T Need A Water Your Plant Daily. The Improved Design Of Plant Watering Devices Can Ensure That The Water Pressure Will Not Be Affected By The Water Level Descended, And The Bottled Water Will Be Totally Exhausted.