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out this itemHas a 1/4-inch barb thread connection, 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. Rotation of the cap allows adjustment of flow and diameter of throw down to a complete shut-off via a ratchet mechanism on the cap and a notch on the base.Adjustable Irrigation Drippers Sprinklers Emitter Drip System, Automatic cleaning, the starting water erosion flow channel, anti-clogging performance.Making effective use of water: Able to maintain constant when long laying or pressure fluctuations, irrigation uniformity, slow watering rate allows soil to absorb water more completely in the root zones of plants.