emitter
 n.— «Feeder tubes. Often called “emitters” or “drip tape” because it’s sold flattened on a roll, these tubes are made from black polyethylene plastic, with holes spaced at regular intervals to dispense water at a relatively constant rate, even with changes in elevation and water pressure.» —“Maintain a Weedless Organic Garden” by Lee Reich Mother Earth News June-July, 2007. (source: Double-Tongued Dictionary)

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