Blisstime 50pcs Adjustable Irrigation Sprinklers Watering Emitter Drip System on 1/4&rdquo; Barb Adjustable Irrigation Drippers Sprinklers Emitter Drip System,Automatic cleaning, the starting water erosion flow channel, anti-clogging performance. Has a 1/4-inch barb thread connection,Great for watering potted plants Suitable for 4mm/ 7mm(Inner/ Outer diameter) tube Able to Maintain constant when Long laying or pressure fluctuations, irrigation uniformity Full open they will cover a 10 to 12 inch circle.