Rely on 17mm Dura Flo™ Dripline (0.560 in. ID X 0.660 in. OD) to deliver water at a steady rate along the entire line. This drip irrigation tubing, also known as a dripperline, features 0.5 GPH pressure-compensating (PC) emitters evenly spaced 18 in. apart. PC emitters have a constant flow rate even if the water pressure changes. The emitters have a turbulent flow design which flushes out sediments that can lead to clogging. Tubing is made of polyethylene, emitters are made of polyethylene and silicone, all treated with UV inhibitors.