DIG Excel Series 16 mm Pressure Compensating Dripline, 18 Inch Emitter Spacing, 0.58 GPH, Black - 1000 FeetIdeal for berries, vines, fruit trees and field crops. DIGs Excel PCD (Pressure Compensating Dripline) 1 2" 16 mm with two outlets per emitter is reliable, durable, and precise with all the features you look for in an economical pressure compensating dripline. The driplines cylindrical drip emitters have exceptional self regulating characteristics to ensure flow uniformity at a wide range of operating pressures, presenting many advantages in water